CVE-2026-49755

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Each returns the full decompressed archive contents as a <tt>[{name, bytes}]</tt> list in memory, with no per-entry or total size cap. <tt>decompress_body/1</tt> walks the <tt>content-encoding</tt> header and chains <tt>:zlib</tt>/<tt>:brotli</tt>/<tt>:ezstd</tt> decoders, so a response advertising <tt>content-encoding: gzip, gzip, gzip</tt> inflates through multiple layers without bound.</p><p>Both steps are enabled by default, no caller opt-in is required, and the attacker controls the <tt>content-type</tt> and <tt>content-encoding</tt> headers on their own server (or on any host reached via Req's automatic redirect following). A sub-megabyte response can expand to multiple gigabytes on the victim, crashing the BEAM process.</p><p>This issue affects req: from 0.1.0 before 0.6.1.</p>"}], "value": "Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in wojtekmach Req allows attacker-controlled HTTP servers to exhaust memory in a Req client via decompression-bomb response bodies.\n\nReq's default response pipeline includes Req.Steps.decode_body/1 and Req.Steps.decompress_body/1 in lib/req/steps.ex. decode_body/1 dispatches on the server-supplied content-type (or URL extension) and calls :zip.extract(body, [:memory]) for application/zip, :erl_tar.extract({:binary, body}, [:memory]) for application/x-tar, and :erl_tar.extract({:binary, body}, [:memory, :compressed]) for application/gzip / .tgz. Each returns the full decompressed archive contents as a [{name, bytes}] list in memory, with no per-entry or total size cap. decompress_body/1 walks the content-encoding header and chains :zlib/:brotli/:ezstd decoders, so a response advertising content-encoding: gzip, gzip, gzip inflates through multiple layers without bound.\n\nBoth steps are enabled by default, no caller opt-in is required, and the attacker controls the content-type and content-encoding headers on their own server (or on any host reached via Req's automatic redirect following). A sub-megabyte response can expand to multiple gigabytes on the victim, crashing the BEAM process.\n\nThis issue affects req: from 0.1.0 before 0.6.1."}], "impacts": [{"capecId": "CAPEC-197", "descriptions": [{"lang": "en", "value": "CAPEC-197 Exponential Data Expansion"}]}], "metrics": [{"cvssV4_0": {"attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 8.2, "baseSeverity": "HIGH", "privilegesRequired": "NONE", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/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"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-409", "description": "CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-06-08T17:14:08.858Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/wojtekmach/req/security/advisories/GHSA-655f-mp8p-96gv"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-49755.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-49755"}, {"tags": ["patch"], "url": "https://github.com/wojtekmach/req/commit/84977e5b1a83f26e749d55ad06e3625464af4e8d"}], "source": {"discovery": "EXTERNAL"}, "title": "Decompression bomb DoS in Req via auto-decoded archive and compressed response bodies", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Disable Req's automatic body decoding on requests that fetch attacker-influenced URLs by passing <tt>decode_body: false</tt> to <tt>'Elixir.Req':new/1</tt> / <tt>'Elixir.Req':get!/1</tt>. To also skip the <tt>content-encoding</tt> decompression pipeline, pass <tt>raw: true</tt>. Both options leave the response body as the raw on-the-wire bytes, so the caller can size-check before any decompression.</p>"}], "value": "Disable Req's automatic body decoding on requests that fetch attacker-influenced URLs by passing decode_body: false to Req.new/1 / Req.get!/1. To also skip the content-encoding decompression pipeline, pass raw: true. Both options leave the response body as the raw on-the-wire bytes, so the caller can size-check before any decompression."}], "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"references": [{"url": "https://github.com/wojtekmach/req/security/advisories/GHSA-655f-mp8p-96gv", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-08T16:49:57.977214Z", "id": "CVE-2026-49755", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"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": "2026-06-08T16:50:03.277Z"}}]}}

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Both options leave the response body as the raw on-the-wire bytes, so the caller can size-check before any decompression.</p>", "base64": false}]}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in wojtekmach Req allows attacker-controlled HTTP servers to exhaust memory in a Req client via decompression-bomb response bodies.\n\nReq's default response pipeline includes Req.Steps.decode_body/1 and Req.Steps.decompress_body/1 in lib/req/steps.ex. decode_body/1 dispatches on the server-supplied content-type (or URL extension) and calls :zip.extract(body, [:memory]) for application/zip, :erl_tar.extract({:binary, body}, [:memory]) for application/x-tar, and :erl_tar.extract({:binary, body}, [:memory, :compressed]) for application/gzip / .tgz. 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A sub-megabyte response can expand to multiple gigabytes on the victim, crashing the BEAM process.\n\nThis issue affects req: from 0.1.0 before 0.6.1.", "supportingMedia": [{"type": "text/html", "value": "Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in wojtekmach Req allows attacker-controlled HTTP servers to exhaust memory in a Req client via decompression-bomb response bodies.<p>Req's default response pipeline includes <tt>'Elixir.Req.Steps':decode_body/1</tt> and <tt>'Elixir.Req.Steps':decompress_body/1</tt> in <tt>lib/req/steps.ex</tt>. <tt>decode_body/1</tt> dispatches on the server-supplied <tt>content-type</tt> (or URL extension) and calls <tt>:zip.extract(body, [:memory])</tt> for <tt>application/zip</tt>, <tt>:erl_tar.extract({:binary, body}, [:memory])</tt> for <tt>application/x-tar</tt>, and <tt>:erl_tar.extract({:binary, body}, [:memory, :compressed])</tt> for <tt>application/gzip</tt> / <tt>.tgz</tt>. Each returns the full decompressed archive contents as a <tt>[{name, bytes}]</tt> list in memory, with no per-entry or total size cap. <tt>decompress_body/1</tt> walks the <tt>content-encoding</tt> header and chains <tt>:zlib</tt>/<tt>:brotli</tt>/<tt>:ezstd</tt> decoders, so a response advertising <tt>content-encoding: gzip, gzip, gzip</tt> inflates through multiple layers without bound.</p><p>Both steps are enabled by default, no caller opt-in is required, and the attacker controls the <tt>content-type</tt> and <tt>content-encoding</tt> headers on their own server (or on any host reached via Req's automatic redirect following). A sub-megabyte response can expand to multiple gigabytes on the victim, crashing the BEAM process.</p><p>This issue affects req: from 0.1.0 before 0.6.1.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-409", "description": "CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:wojtekmach:req:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "0.6.1", "versionStartIncluding": "0.1.0"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-06-08T17:14:08.858Z"}}}, "cveMetadata": {"cveId": "CVE-2026-49755", "state": "PUBLISHED", "dateUpdated": "2026-06-08T17:14:08.858Z", "dateReserved": "2026-06-01T13:45:22.448Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-06-08T15:20:57.415Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

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Each returns the full decompressed archive contents as a [{name, bytes}] list in memory, with no per-entry or total size cap. decompress_body/1 walks the content-encoding header and chains :zlib/:brotli/:ezstd decoders, so a response advertising content-encoding: gzip, gzip, gzip inflates through multiple layers without bound.\n\nBoth steps are enabled by default, no caller opt-in is required, and the attacker controls the content-type and content-encoding headers on their own server (or on any host reached via Req's automatic redirect following). A sub-megabyte response can expand to multiple gigabytes on the victim, crashing the BEAM process.\n\nThis issue affects req: from 0.1.0 before 0.6.1."}, {"lang": "es", "value": "La vulnerabilidad de manejo inadecuado de datos altamente comprimidos (amplificaci\u00f3n de datos) en wojtekmach Req permite a los servidores HTTP controlados por el atacante agotar la memoria en un cliente Req mediante cuerpos de respuesta de bomba de descompresi\u00f3n.\n\nLa pipeline de respuesta predeterminada de Req incluye Req.Steps.decode_body/1 y Req.Steps.decompress_body/1 en lib/req/steps.ex. decode_body/1 despacha seg\u00fan el content-type proporcionado por el servidor (o extensi\u00f3n de URL) y llama a :zip.extract(body, [:memory]) para application/zip, a :erl_tar.extract({:binary, body}, [:memory]) para application/x-tar, y a :erl_tar.extract({:binary, body}, [:memory, :compressed]) para application/gzip / .tgz. Cada uno devuelve el contenido completo del archivo descomprimido como una lista [{name, bytes}] en memoria, sin l\u00edmite de tama\u00f1o por entrada o total. decompress_body/1 recorre el encabezado content-encoding y encadena decodificadores :zlib/:brotli/:ezstd, por lo que una respuesta que anuncia content-encoding: gzip, gzip, gzip se infla a trav\u00e9s de m\u00faltiples capas sin l\u00edmite.\n\nAmbos pasos est\u00e1n habilitados por defecto, no se requiere la participaci\u00f3n del llamador, y el atacante controla los encabezados content-type y content-encoding en su propio servidor (o en cualquier host alcanzado a trav\u00e9s del seguimiento autom\u00e1tico de redirecciones de Req). Una respuesta de menos de un megabyte puede expandirse a m\u00faltiples gigabytes en la v\u00edctima, colapsando el proceso BEAM.\n\nEste problema afecta a req: desde 0.1.0 antes de 0.6.1."}], "id": "CVE-2026-49755", "lastModified": "2026-08-18T15:46:34.387", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.2, "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:P/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-2026-49755", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-08T16:49:57.977214Z", "version": "2.0.3"}}]}, "published": "2026-06-08T16:16:43.860", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Third Party Advisory"], "url": "https://cna.erlef.org/cves/CVE-2026-49755.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch"], "url": "https://github.com/wojtekmach/req/commit/84977e5b1a83f26e749d55ad06e3625464af4e8d"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Vendor Advisory", "Exploit", "Patch"], "url": "https://github.com/wojtekmach/req/security/advisories/GHSA-655f-mp8p-96gv"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Third Party Advisory", "Patch", "Mitigation"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-49755"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Vendor Advisory", "Exploit", "Patch"], "url": "https://github.com/wojtekmach/req/security/advisories/GHSA-655f-mp8p-96gv"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-409"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.1.0,0.6.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e37753741cbdc725e6aba3d977b380163bfc0ecb,84977e5b1a83f26e749d55ad06e3625464af4e8d)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "req", "vendor": "wojtekmach"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.1.0,0.6.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "req", "source": "cna", "vendor": "wojtekmach"}, "product": "req", "vendor": "wojtekmach"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e37753741cbdc725e6aba3d977b380163bfc0ecb,84977e5b1a83f26e749d55ad06e3625464af4e8d)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "req", "source": "cna", "vendor": "wojtekmach"}, "product": "req", "vendor": "wojtekmach"}], "created": "2026-06-08T16:45:26.665249+00:00", "updated": "2026-06-08T17:45:16.069310+00:00", "vendors": ["wojtekmach", "wojtekmach$PRODUCT$req"]}