CVE-2026-65624

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-65624", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-07-22T13:55:59.401Z", "datePublished": "2026-07-28T10:01:01.811Z", "dateUpdated": "2026-07-29T04:17:22.788Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["cowboy_http"], "packageName": "cowboy", "packageURL": "pkg:hex/cowboy", "product": "cowboy", "programFiles": ["src/cowboy_http.erl"], "programRoutines": [{"name": "cowboy_http:parse_header/3"}, {"name": "cowboy_http:parse_hd_value/6"}], "repo": "https://github.com/ninenines/cowboy", "vendor": "ninenines", "versions": [{"lessThan": "2.18.0", "status": "affected", "version": "2.0.0-pre.4", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["cowboy_http"], "packageName": "ninenines/cowboy", "packageURL": "pkg:github/ninenines/cowboy", "product": "cowboy", "programFiles": ["src/cowboy_http.erl"], "programRoutines": [{"name": "cowboy_http:parse_header/3"}, {"name": "cowboy_http:parse_hd_value/6"}], "repo": "https://github.com/ninenines/cowboy", "vendor": "ninenines", "versions": [{"lessThan": "3a34d8c1cfd94326466aa16a9017236691dc9c55", "status": "affected", "version": "309780a9fda145c262a47ac7811ffd50a0271c5b", "versionType": "git"}]}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.18.0", "versionStartIncluding": "2.0.0-pre.4", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "finder", "value": "Qiyi Deng / Wuhan University"}, {"lang": "en", "type": "finder", "value": "Min Shi / Wuhan University"}, {"lang": "en", "type": "finder", "value": "Yongkang Xiao / Wuhan University"}, {"lang": "en", "type": "finder", "value": "Jing Chen / Wuhan University"}, {"lang": "en", "type": "remediation developer", "value": "Lo\u00efc Hoguin"}, {"lang": "en", "type": "analyst", "value": "Jonatan M\u00e4nnchen / EEF"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowboy allows an unauthenticated remote attacker to exhaust connection process memory over HTTP/1.1.</p><p>The HTTP/1.1 handler in <tt>cowboy_http</tt> enforces the <tt>max_headers</tt> limit by counting the number of distinct header names in a map (<tt>maps:size(Headers)</tt>). When a request contains multiple header lines with the same name, the values are concatenated into a single ever-growing binary stored under that one map key (<tt>\", \"</tt> for regular headers, <tt>\"; \"</tt> for cookies), so the map size stays at one and the <tt>max_headers</tt> cap (default 100) is never reached. Because no accumulator bounds the total number of header lines or the total byte size of the header block (only per-line <tt>max_header_name_length</tt> and <tt>max_header_value_length</tt> apply), an unauthenticated client can send an arbitrary number of header lines with the same name and grow the connection process's binary memory to arbitrary size within the request window.</p><p>The impact per connection is bounded by <tt>request_timeout</tt> (default 5 seconds, not reset by header data), and by <tt>max_heap_size</tt> when set (the offending connection process is killed once its heap grows past the limit). When <tt>max_heap_size</tt> is left at the default (unset), sustained abuse can drive the Erlang VM into out-of-memory conditions.</p><p>This issue affects cowboy from 2.0.0-pre.4 before 2.18.0.</p>"}], "value": "Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowboy allows an unauthenticated remote attacker to exhaust connection process memory over HTTP/1.1.\n\nThe HTTP/1.1 handler in cowboy_http enforces the max_headers limit by counting the number of distinct header names in a map (maps:size(Headers)). When a request contains multiple header lines with the same name, the values are concatenated into a single ever-growing binary stored under that one map key (\", \" for regular headers, \"; \" for cookies), so the map size stays at one and the max_headers cap (default 100) is never reached. Because no accumulator bounds the total number of header lines or the total byte size of the header block (only per-line max_header_name_length and max_header_value_length apply), an unauthenticated client can send an arbitrary number of header lines with the same name and grow the connection process's binary memory to arbitrary size within the request window.\n\nThe impact per connection is bounded by request_timeout (default 5 seconds, not reset by header data), and by max_heap_size when set (the offending connection process is killed once its heap grows past the limit). When max_heap_size is left at the default (unset), sustained abuse can drive the Erlang VM into out-of-memory conditions.\n\nThis issue affects cowboy from 2.0.0-pre.4 before 2.18.0."}], "impacts": [{"capecId": "CAPEC-130", "descriptions": [{"lang": "en", "value": "CAPEC-130 Excessive Allocation"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "baseScore": 6.9, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N", "version": "4.0"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-07-29T04:17:22.788Z"}, "references": [{"tags": ["related", "third-party-advisory"], "url": "https://cna.erlef.org/cves/CVE-2026-65624.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-65624"}, {"tags": ["patch"], "url": "https://github.com/ninenines/cowboy/commit/3a34d8c1cfd94326466aa16a9017236691dc9c55"}], "source": {"discovery": "EXTERNAL"}, "title": "Cowboy HTTP/1.1 max_headers Bypass via Duplicate Header Names Enables Memory Exhaustion", "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-28T12:38:53.899266Z", "id": "CVE-2026-65624", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-28T12:39:27.067Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-65624", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-28T12:38:53.899266Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-28T12:39:19.571Z"}}], "cna": {"title": "Cowboy HTTP/1.1 max_headers Bypass via Duplicate Header Names Enables Memory Exhaustion", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Qiyi Deng / Wuhan University"}, {"lang": "en", "type": "finder", "value": "Min Shi / Wuhan University"}, {"lang": "en", "type": "finder", "value": "Yongkang Xiao / Wuhan University"}, {"lang": "en", "type": "finder", "value": "Jing Chen / Wuhan University"}, {"lang": "en", "type": "remediation developer", "value": "Lo\u00efc Hoguin"}, {"lang": "en", "type": "analyst", "value": "Jonatan M\u00e4nnchen / EEF"}], "impacts": [{"capecId": "CAPEC-130", "descriptions": [{"lang": "en", "value": "CAPEC-130 Excessive Allocation"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "baseScore": 6.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"cpes": ["cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"], "repo": "https://github.com/ninenines/cowboy", "vendor": "ninenines", "modules": ["cowboy_http"], "product": "cowboy", "versions": [{"status": "affected", "version": "2.0.0-pre.4", "lessThan": "2.18.0", "versionType": "semver"}], "packageURL": "pkg:hex/cowboy", "packageName": "cowboy", "programFiles": ["src/cowboy_http.erl"], "collectionURL": "https://repo.hex.pm", "defaultStatus": "unaffected", "programRoutines": [{"name": "cowboy_http:parse_header/3"}, {"name": "cowboy_http:parse_hd_value/6"}]}, {"cpes": ["cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"], "repo": "https://github.com/ninenines/cowboy", "vendor": "ninenines", "modules": ["cowboy_http"], "product": "cowboy", "versions": [{"status": "affected", "version": "309780a9fda145c262a47ac7811ffd50a0271c5b", "lessThan": "3a34d8c1cfd94326466aa16a9017236691dc9c55", "versionType": "git"}], "packageURL": "pkg:github/ninenines/cowboy", "packageName": "ninenines/cowboy", "programFiles": ["src/cowboy_http.erl"], "collectionURL": "https://github.com", "defaultStatus": "unaffected", "programRoutines": [{"name": "cowboy_http:parse_header/3"}, {"name": "cowboy_http:parse_hd_value/6"}]}], "references": [{"url": "https://cna.erlef.org/cves/CVE-2026-65624.html", "tags": ["related", "third-party-advisory"]}, {"url": "https://osv.dev/vulnerability/EEF-CVE-2026-65624", "tags": ["related"]}, {"url": "https://github.com/ninenines/cowboy/commit/3a34d8c1cfd94326466aa16a9017236691dc9c55", "tags": ["patch"]}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowboy allows an unauthenticated remote attacker to exhaust connection process memory over HTTP/1.1.\n\nThe HTTP/1.1 handler in cowboy_http enforces the max_headers limit by counting the number of distinct header names in a map (maps:size(Headers)). When a request contains multiple header lines with the same name, the values are concatenated into a single ever-growing binary stored under that one map key (\", \" for regular headers, \"; \" for cookies), so the map size stays at one and the max_headers cap (default 100) is never reached. Because no accumulator bounds the total number of header lines or the total byte size of the header block (only per-line max_header_name_length and max_header_value_length apply), an unauthenticated client can send an arbitrary number of header lines with the same name and grow the connection process's binary memory to arbitrary size within the request window.\n\nThe impact per connection is bounded by request_timeout (default 5 seconds, not reset by header data), and by max_heap_size when set (the offending connection process is killed once its heap grows past the limit). When max_heap_size is left at the default (unset), sustained abuse can drive the Erlang VM into out-of-memory conditions.\n\nThis issue affects cowboy from 2.0.0-pre.4 before 2.18.0.", "supportingMedia": [{"type": "text/html", "value": "<p>Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowboy allows an unauthenticated remote attacker to exhaust connection process memory over HTTP/1.1.</p><p>The HTTP/1.1 handler in <tt>cowboy_http</tt> enforces the <tt>max_headers</tt> limit by counting the number of distinct header names in a map (<tt>maps:size(Headers)</tt>). When a request contains multiple header lines with the same name, the values are concatenated into a single ever-growing binary stored under that one map key (<tt>\", \"</tt> for regular headers, <tt>\"; \"</tt> for cookies), so the map size stays at one and the <tt>max_headers</tt> cap (default 100) is never reached. Because no accumulator bounds the total number of header lines or the total byte size of the header block (only per-line <tt>max_header_name_length</tt> and <tt>max_header_value_length</tt> apply), an unauthenticated client can send an arbitrary number of header lines with the same name and grow the connection process's binary memory to arbitrary size within the request window.</p><p>The impact per connection is bounded by <tt>request_timeout</tt> (default 5 seconds, not reset by header data), and by <tt>max_heap_size</tt> when set (the offending connection process is killed once its heap grows past the limit). When <tt>max_heap_size</tt> is left at the default (unset), sustained abuse can drive the Erlang VM into out-of-memory conditions.</p><p>This issue affects cowboy from 2.0.0-pre.4 before 2.18.0.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "2.18.0", "versionStartIncluding": "2.0.0-pre.4"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-07-29T04:17:22.788Z"}}}, "cveMetadata": {"cveId": "CVE-2026-65624", "state": "PUBLISHED", "dateUpdated": "2026-07-29T04:17:22.788Z", "dateReserved": "2026-07-22T13:55:59.401Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-07-28T10:01:01.811Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["cowboy_http"], "packageName": "cowboy", "packageURL": "pkg:hex/cowboy", "product": "cowboy", "programFiles": ["src/cowboy_http.erl"], "programRoutines": [{"name": "cowboy_http:parse_header/3"}, {"name": "cowboy_http:parse_hd_value/6"}], "repo": "https://github.com/ninenines/cowboy", "vendor": "ninenines", "versions": [{"lessThan": "2.18.0", "status": "affected", "version": "2.0.0-pre.4", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["cowboy_http"], "packageName": "ninenines/cowboy", "packageURL": "pkg:github/ninenines/cowboy", "product": "cowboy", "programFiles": ["src/cowboy_http.erl"], "programRoutines": [{"name": "cowboy_http:parse_header/3"}, {"name": "cowboy_http:parse_hd_value/6"}], "repo": "https://github.com/ninenines/cowboy", "vendor": "ninenines", "versions": [{"lessThan": "3a34d8c1cfd94326466aa16a9017236691dc9c55", "status": "affected", "version": "309780a9fda145c262a47ac7811ffd50a0271c5b", "versionType": "git"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowboy allows an unauthenticated remote attacker to exhaust connection process memory over HTTP/1.1.\n\nThe HTTP/1.1 handler in cowboy_http enforces the max_headers limit by counting the number of distinct header names in a map (maps:size(Headers)). When a request contains multiple header lines with the same name, the values are concatenated into a single ever-growing binary stored under that one map key (\", \" for regular headers, \"; \" for cookies), so the map size stays at one and the max_headers cap (default 100) is never reached. Because no accumulator bounds the total number of header lines or the total byte size of the header block (only per-line max_header_name_length and max_header_value_length apply), an unauthenticated client can send an arbitrary number of header lines with the same name and grow the connection process's binary memory to arbitrary size within the request window.\n\nThe impact per connection is bounded by request_timeout (default 5 seconds, not reset by header data), and by max_heap_size when set (the offending connection process is killed once its heap grows past the limit). When max_heap_size is left at the default (unset), sustained abuse can drive the Erlang VM into out-of-memory conditions.\n\nThis issue affects cowboy from 2.0.0-pre.4 before 2.18.0."}, {"lang": "es", "value": "Vulnerabilidad de asignaci\u00f3n de recursos sin l\u00edmites ni limitaci\u00f3n en ninenines cowboy permite a un atacante remoto no autenticado agotar la memoria del proceso de conexi\u00f3n a trav\u00e9s de HTTP/1.1.\n\nEl gestor HTTP/1.1 en cowboy_http aplica el l\u00edmite max_headers contando el n\u00famero de nombres de encabezado distintos en un mapa (maps:size(Headers)). Cuando una solicitud contiene m\u00faltiples l\u00edneas de encabezado con el mismo nombre, los valores se concatenan en un \u00fanico binario en constante crecimiento almacenado bajo esa \u00fanica clave de mapa (\u2019, \u2019 para encabezados regulares, \u2019; \u2019 para cookies), por lo que el tama\u00f1o del mapa permanece en uno y el l\u00edmite max_headers (predeterminado 100) nunca se alcanza. Debido a que ning\u00fan acumulador limita el n\u00famero total de l\u00edneas de encabezado o el tama\u00f1o total en bytes del bloque de encabezado (solo se aplican max_header_name_length y max_header_value_length por l\u00ednea), un cliente no autenticado puede enviar un n\u00famero arbitrario de l\u00edneas de encabezado con el mismo nombre y aumentar la memoria binaria del proceso de conexi\u00f3n a un tama\u00f1o arbitrario dentro de la ventana de solicitud.\n\nEl impacto por conexi\u00f3n est\u00e1 limitado por request_timeout (predeterminado 5 segundos, no se restablece por los datos del encabezado), y por max_heap_size cuando se establece (el proceso de conexi\u00f3n infractor se termina una vez que su heap supera el l\u00edmite). Cuando max_heap_size se deja en el valor predeterminado (no establecido), el abuso sostenido puede llevar a la VM de Erlang a condiciones de falta de memoria.\n\nEste problema afecta a cowboy desde 2.0.0-pre.4 antes de 2.18.0."}], "id": "CVE-2026-65624", "lastModified": "2026-10-24T13:10:00.147", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-65624", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-28T12:38:53.899266Z", "version": "2.0.3"}}]}, "published": "2026-07-28T10:16:50.500", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-65624.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/ninenines/cowboy/commit/3a34d8c1cfd94326466aa16a9017236691dc9c55"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-65624"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2026:47231", "cpe": "cpe:/a:redhat:hummingbird:1", "impact": "important", "package": "rabbitmq-server4-3-main-4.3.4-0.2.hum1", "product_name": "Red Hat Hardened Images", "release_date": "2026-07-28T00:00:00Z"}, {"advisory": "RHSA-2026:47236", "cpe": "cpe:/a:redhat:hummingbird:1", "impact": "important", "package": "rabbitmq-server4-2-main-4.2.9-0.2.hum1", "product_name": "Red Hat Hardened Images", "release_date": "2026-07-28T00:00:00Z"}], "bugzilla": {"description": "cowboy: Cowboy: Denial of Service via HTTP/1.1 duplicate header names", "id": "2507960", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507960"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-1050", "details": ["A flaw was found in Cowboy. An unauthenticated remote attacker can exploit this vulnerability by sending multiple HTTP/1.1 header lines with the same name. This bypasses the `max_headers` limit, causing the connection process memory to grow uncontrollably. This can lead to memory exhaustion and a Denial of Service (DoS) condition in the Erlang Virtual Machine (VM)."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-65624", "public_date": "2026-07-28T10:01:01Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-65624\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-65624\nhttps://cna.erlef.org/cves/CVE-2026-65624.html\nhttps://github.com/ninenines/cowboy/commit/3a34d8c1cfd94326466aa16a9017236691dc9c55\nhttps://osv.dev/vulnerability/EEF-CVE-2026-65624"], "statement": "This Important vulnerability allows an unauthenticated remote attacker to cause a denial of service by sending crafted HTTP/1.1 requests with duplicate header names. The `cowboy` library, utilized by components such as `rabbitmq-server` in Red Hat Hardened Images, fails to properly limit memory consumption from concatenated header values. This can lead to memory exhaustion of the Erlang Virtual Machine, impacting service availability, particularly if the `max_heap_size` is not explicitly configured.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.0.0-pre.4,2.18.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[309780a9fda145c262a47ac7811ffd50a0271c5b,3a34d8c1cfd94326466aa16a9017236691dc9c55)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "cowboy", "vendor": "ninenines"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.0.0-pre.4,2.18.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "cowboy", "source": "cna", "vendor": "ninenines"}, "product": "cowboy", "vendor": "ninenines"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[309780a9fda145c262a47ac7811ffd50a0271c5b,3a34d8c1cfd94326466aa16a9017236691dc9c55)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "cowboy", "source": "cna", "vendor": "ninenines"}, "product": "cowboy", "vendor": "ninenines"}], "created": "2026-07-28T20:00:10.525393+00:00", "updated": "2026-08-02T09:45:16.733172+00:00", "vendors": ["ninenines", "ninenines$PRODUCT$cowboy"]}