CVE-2026-32689

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Phoenix LiveView applications enable the longpoll transport by default via the <tt>/live</tt> socket."}], "value": "A Phoenix.Socket must be configured with the longpoll option enabled. Phoenix LiveView applications enable the longpoll transport by default via the /live socket."}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:phoenixframework:phoenix:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.7.22", "versionStartIncluding": "1.7.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:phoenixframework:phoenix:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.8.6", "versionStartIncluding": "1.8.0", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "finder", "value": "Peter Ullrich"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Allocation of Resources Without Limits or Throttling vulnerability in phoenixframework phoenix allows a denial of service via the long-poll transport's NDJSON body handling.<p>In <tt>'Elixir.Phoenix.Transports.LongPoll':publish/4</tt>, when a POST request is received with <tt>Content-Type: application/x-ndjson</tt>, the request body is split on newline characters using <tt>String.split/2</tt> with no limit on the number of resulting segments. An attacker can send a body consisting entirely of newline bytes, causing a 1:1 amplification into a list of empty binaries \u2014 a 1 MB body produces approximately one million list elements, an 8 MB body approximately 8.4 million. Each element is then walked by <tt>Enum.map</tt>, materializing another list of the same size. This exhausts BEAM memory and schedulers, crashing the node and terminating all active sessions.</p><p>A session token required to reach the vulnerable endpoint is freely obtainable by any client via an unauthenticated GET request to the same URL with a matching <tt>Origin</tt> header, making this attack effectively unauthenticated.</p><p>This issue affects phoenix: from 1.7.0 before 1.7.22 and 1.8.6.</p>"}], "value": "Allocation of Resources Without Limits or Throttling vulnerability in phoenixframework phoenix allows a denial of service via the long-poll transport's NDJSON body handling.\n\nIn 'Elixir.Phoenix.Transports.LongPoll':publish/4, when a POST request is received with Content-Type: application/x-ndjson, the request body is split on newline characters using String.split/2 with no limit on the number of resulting segments. An attacker can send a body consisting entirely of newline bytes, causing a 1:1 amplification into a list of empty binaries \u2014 a 1 MB body produces approximately one million list elements, an 8 MB body approximately 8.4 million. Each element is then walked by Enum.map, materializing another list of the same size. This exhausts BEAM memory and schedulers, crashing the node and terminating all active sessions.\n\nA session token required to reach the vulnerable endpoint is freely obtainable by any client via an unauthenticated GET request to the same URL with a matching Origin header, making this attack effectively unauthenticated.\n\nThis issue affects phoenix: from 1.7.0 before 1.7.22 and 1.8.6."}], "impacts": [{"capecId": "CAPEC-130", "descriptions": [{"lang": "en", "value": "CAPEC-130 Excessive Allocation"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 8.7, "baseSeverity": "HIGH", "exploitMaturity": "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:H/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "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": "2026-05-07T04:25:07.013Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/phoenixframework/phoenix/security/advisories/GHSA-628h-q48j-jr6q"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-32689.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-32689"}, {"tags": ["patch"], "url": "https://github.com/phoenixframework/phoenix/commit/1a67c61ff9ce0a7711662ac7354861917a7c80f7"}, {"tags": ["patch"], "url": "https://github.com/phoenixframework/phoenix/commit/912ea181fd247c21dbcc49fb97d0053b947d81bf"}], "source": {"discovery": "EXTERNAL"}, "title": "Long-poll NDJSON body splitting causes unbounded memory allocation in Phoenix", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Disable the longpoll transport on all <tt>Phoenix.Socket</tt> declarations, including the LiveView <tt>/live</tt> socket, by removing or setting <tt>longpoll: false</tt>. Note that this prevents clients that cannot use WebSockets from connecting."}], "value": "Disable the longpoll transport on all Phoenix.Socket declarations, including the LiveView /live socket, by removing or setting longpoll: false. Note that this prevents clients that cannot use WebSockets from connecting."}], "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-05T18:37:12.444769Z", "id": "CVE-2026-32689", "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": "2026-05-06T15:25:17.607Z"}}]}}

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Note that this prevents clients that cannot use WebSockets from connecting.", "supportingMedia": [{"type": "text/html", "value": "Disable the longpoll transport on all <tt>Phoenix.Socket</tt> declarations, including the LiveView <tt>/live</tt> socket, by removing or setting <tt>longpoll: false</tt>. Note that this prevents clients that cannot use WebSockets from connecting.", "base64": false}]}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "Allocation of Resources Without Limits or Throttling vulnerability in phoenixframework phoenix allows a denial of service via the long-poll transport's NDJSON body handling.\n\nIn 'Elixir.Phoenix.Transports.LongPoll':publish/4, when a POST request is received with Content-Type: application/x-ndjson, the request body is split on newline characters using String.split/2 with no limit on the number of resulting segments. An attacker can send a body consisting entirely of newline bytes, causing a 1:1 amplification into a list of empty binaries \u2014 a 1 MB body produces approximately one million list elements, an 8 MB body approximately 8.4 million. Each element is then walked by Enum.map, materializing another list of the same size. This exhausts BEAM memory and schedulers, crashing the node and terminating all active sessions.\n\nA session token required to reach the vulnerable endpoint is freely obtainable by any client via an unauthenticated GET request to the same URL with a matching Origin header, making this attack effectively unauthenticated.\n\nThis issue affects phoenix: from 1.7.0 before 1.7.22 and 1.8.6.", "supportingMedia": [{"type": "text/html", "value": "Allocation of Resources Without Limits or Throttling vulnerability in phoenixframework phoenix allows a denial of service via the long-poll transport's NDJSON body handling.<p>In <tt>'Elixir.Phoenix.Transports.LongPoll':publish/4</tt>, when a POST request is received with <tt>Content-Type: application/x-ndjson</tt>, the request body is split on newline characters using <tt>String.split/2</tt> with no limit on the number of resulting segments. An attacker can send a body consisting entirely of newline bytes, causing a 1:1 amplification into a list of empty binaries \u2014 a 1 MB body produces approximately one million list elements, an 8 MB body approximately 8.4 million. Each element is then walked by <tt>Enum.map</tt>, materializing another list of the same size. This exhausts BEAM memory and schedulers, crashing the node and terminating all active sessions.</p><p>A session token required to reach the vulnerable endpoint is freely obtainable by any client via an unauthenticated GET request to the same URL with a matching <tt>Origin</tt> header, making this attack effectively unauthenticated.</p><p>This issue affects phoenix: from 1.7.0 before 1.7.22 and 1.8.6.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling"}]}], "configurations": [{"lang": "en", "value": "A Phoenix.Socket must be configured with the longpoll option enabled. Phoenix LiveView applications enable the longpoll transport by default via the /live socket.", "supportingMedia": [{"type": "text/html", "value": "A <tt>Phoenix.Socket</tt> must be configured with the <tt>longpoll</tt> option enabled. 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An attacker can send a body consisting entirely of newline bytes, causing a 1:1 amplification into a list of empty binaries \u2014 a 1 MB body produces approximately one million list elements, an 8 MB body approximately 8.4 million. Each element is then walked by Enum.map, materializing another list of the same size. This exhausts BEAM memory and schedulers, crashing the node and terminating all active sessions.\n\nA session token required to reach the vulnerable endpoint is freely obtainable by any client via an unauthenticated GET request to the same URL with a matching Origin header, making this attack effectively unauthenticated.\n\nThis issue affects phoenix: from 1.7.0 before 1.7.22 and 1.8.6."}, {"lang": "es", "value": "Vulnerabilidad de asignaci\u00f3n de recursos sin l\u00edmites ni estrangulamiento en phoenixframework phoenix permite una denegaci\u00f3n de servicio a trav\u00e9s del manejo del cuerpo NDJSON del transporte long-poll.\n\nEn \u2019Elixir.Phoenix.Transports.LongPoll\u2019:publish/4, cuando se recibe una solicitud POST con Content-Type: application/x-ndjson, el cuerpo de la solicitud se divide en caracteres de nueva l\u00ednea usando String.split/2 sin l\u00edmite en el n\u00famero de segmentos resultantes. Un atacante puede enviar un cuerpo que consiste enteramente en bytes de nueva l\u00ednea, causando una amplificaci\u00f3n 1:1 en una lista de binarios vac\u00edos - un cuerpo de 1 MB produce aproximadamente un mill\u00f3n de elementos de lista, un cuerpo de 8 MB aproximadamente 8.4 millones. Cada elemento es luego recorrido por Enum.map, materializando otra lista del mismo tama\u00f1o. Esto agota la memoria y los planificadores de BEAM, colapsando el nodo y terminando todas las sesiones activas.\n\nUn token de sesi\u00f3n requerido para alcanzar el endpoint vulnerable es libremente obtenible por cualquier cliente a trav\u00e9s de una solicitud GET no autenticada a la misma URL con una cabecera Origin coincidente, haciendo que este ataque sea efectivamente no autenticado.\n\nEste problema afecta a phoenix: desde 1.7.0 antes de 1.7.22 y 1.8.6."}], "id": "CVE-2026-32689", "lastModified": "2026-10-26T19:10:00.163", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "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:H/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": "HIGH", "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-2026-32689", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-05T18:37:12.444769Z", "version": "2.0.3"}}]}, "published": "2026-05-05T16:16:11.397", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-32689.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/phoenixframework/phoenix/commit/1a67c61ff9ce0a7711662ac7354861917a7c80f7"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/phoenixframework/phoenix/commit/912ea181fd247c21dbcc49fb97d0053b947d81bf"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/phoenixframework/phoenix/security/advisories/GHSA-628h-q48j-jr6q"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-32689"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.7.0,1.7.22)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.8.0,1.8.6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "phoenix", "source": "cna", "vendor": "phoenixframework"}, "product": "phoenix", "vendor": "phoenixframework"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2674c6ea30634667f9b09966b90269393b445953,*)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "code_commit", "value": "1a67c61ff9ce0a7711662ac7354861917a7c80f7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "code_commit", "value": "912ea181fd247c21dbcc49fb97d0053b947d81bf"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "phoenix", "source": "cna", "vendor": "phoenixframework"}, "product": "phoenix", "vendor": "phoenixframework"}], "created": "2026-05-05T18:00:13.730610+00:00", "updated": "2026-05-05T18:30:29.596364+00:00", "vendors": ["phoenixframework", "phoenixframework$PRODUCT$phoenix"]}