CVE-2026-39805

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When a request contains two <tt>Content-Length</tt> headers with different values, Bandit silently accepts it, uses the first value to read the body, and dispatches the remaining bytes as a second pipelined request on the same keep-alive connection. RFC 9112 \u00a76.3 requires recipients to treat this as an unrecoverable framing error.</p><p>When Bandit sits behind a proxy that picks the last <tt>Content-Length</tt> value and forwards the request rather than rejecting it, an unauthenticated attacker can smuggle requests past edge WAF rules, path-based ACLs, rate limiting, and audit logging.</p><p>This issue affects bandit: before 1.11.0.</p>"}], "value": "Inconsistent Interpretation of HTTP Requests vulnerability in mtrudel bandit allows HTTP request smuggling via duplicate Content-Length headers.\n\n'Elixir.Bandit.Headers':get_content_length/1 in lib/bandit/headers.ex uses List.keyfind/3, which returns only the first matching header. 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When a request contains two Content-Length headers with different values, Bandit silently accepts it, uses the first value to read the body, and dispatches the remaining bytes as a second pipelined request on the same keep-alive connection. RFC 9112 \u00a76.3 requires recipients to treat this as an unrecoverable framing error.\n\nWhen Bandit sits behind a proxy that picks the last Content-Length value and forwards the request rather than rejecting it, an unauthenticated attacker can smuggle requests past edge WAF rules, path-based ACLs, rate limiting, and audit logging.\n\nThis issue affects bandit: before 1.11.0.", "supportingMedia": [{"type": "text/html", "value": "Inconsistent Interpretation of HTTP Requests vulnerability in mtrudel bandit allows HTTP request smuggling via duplicate <tt>Content-Length</tt> headers.<p><tt>'Elixir.Bandit.Headers':get_content_length/1</tt> in <tt>lib/bandit/headers.ex</tt> uses <tt>List.keyfind/3</tt>, which returns only the first matching header. When a request contains two <tt>Content-Length</tt> headers with different values, Bandit silently accepts it, uses the first value to read the body, and dispatches the remaining bytes as a second pipelined request on the same keep-alive connection. RFC 9112 \u00a76.3 requires recipients to treat this as an unrecoverable framing error.</p><p>When Bandit sits behind a proxy that picks the last <tt>Content-Length</tt> value and forwards the request rather than rejecting it, an unauthenticated attacker can smuggle requests past edge WAF rules, path-based ACLs, rate limiting, and audit logging.</p><p>This issue affects bandit: before 1.11.0.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-444", "description": "CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "1.11.0", "versionStartIncluding": "0.1.0"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-07-24T14:16:00.658Z"}}}, "cveMetadata": {"cveId": "CVE-2026-39805", "state": "PUBLISHED", "dateUpdated": "2026-07-24T14:16:00.658Z", "dateReserved": "2026-04-07T12:28:54.916Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-05-01T20:34:29.400Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Bandit.Headers'"], "packageName": "bandit", "packageURL": "pkg:hex/bandit", "product": "bandit", "programFiles": ["lib/bandit/headers.ex"], "programRoutines": [{"name": "'Elixir.Bandit.Headers':get_content_length/1"}], "repo": "https://github.com/mtrudel/bandit", "vendor": "mtrudel", "versions": [{"lessThan": "1.11.0", "status": "affected", "version": "0.1.0", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Bandit.Headers'"], "packageName": "mtrudel/bandit", "packageURL": "pkg:github/mtrudel/bandit", "product": "bandit", "programFiles": ["lib/bandit/headers.ex"], "programRoutines": [{"name": "'Elixir.Bandit.Headers':get_content_length/1"}], "repo": "https://github.com/mtrudel/bandit", "vendor": "mtrudel", "versions": [{"lessThan": "f2ca636eb6df385219957e8934e9fc6efa1630d1", "status": "affected", "version": "7bc8d97cd22697c299baa8012b7f419a7606a80c", "versionType": "git"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Inconsistent Interpretation of HTTP Requests vulnerability in mtrudel bandit allows HTTP request smuggling via duplicate Content-Length headers.\n\n'Elixir.Bandit.Headers':get_content_length/1 in lib/bandit/headers.ex uses List.keyfind/3, which returns only the first matching header. When a request contains two Content-Length headers with different values, Bandit silently accepts it, uses the first value to read the body, and dispatches the remaining bytes as a second pipelined request on the same keep-alive connection. RFC 9112 \u00a76.3 requires recipients to treat this as an unrecoverable framing error.\n\nWhen Bandit sits behind a proxy that picks the last Content-Length value and forwards the request rather than rejecting it, an unauthenticated attacker can smuggle requests past edge WAF rules, path-based ACLs, rate limiting, and audit logging.\n\nThis issue affects bandit: before 1.11.0."}, {"lang": "es", "value": "Vulnerabilidad de interpretaci\u00f3n inconsistente de solicitudes HTTP en mtrudel bandit permite el contrabando de solicitudes HTTP mediante encabezados Content-Length duplicados.\n\n\u2019Elixir.Bandit.Headers\u2019:get_content_length/1 en lib/bandit/headers.ex usa List.keyfind/3, que devuelve solo el primer encabezado coincidente. Cuando una solicitud contiene dos encabezados Content-Length con valores diferentes, Bandit lo acepta silenciosamente, usa el primer valor para leer el cuerpo y despacha los bytes restantes como una segunda solicitud en pipeline en la misma conexi\u00f3n keep-alive. RFC 9112 \u00a76.3 requiere que los receptores traten esto como un error de encuadre irrecuperable.\n\nCuando Bandit se encuentra detr\u00e1s de un proxy que elige el \u00faltimo valor de Content-Length y reenv\u00eda la solicitud en lugar de rechazarla, un atacante no autenticado puede contrabandear solicitudes eludiendo las reglas de WAF de borde, las ACLs basadas en rutas, la limitaci\u00f3n de velocidad y el registro de auditor\u00eda.\n\nEste problema afecta a bandit: antes de 1.11.0."}], "id": "CVE-2026-39805", "lastModified": "2026-10-26T22:10:00.163", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.3, "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:P/PR:N/UI:N/VC:L/VI:L/VA:N/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": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-39805", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-02T01:20:49.825555Z", "version": "2.0.3"}}]}, "published": "2026-05-01T21:16:17.037", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-39805.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/mtrudel/bandit/commit/f2ca636eb6df385219957e8934e9fc6efa1630d1"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-c67r-gc9j-2qf7"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-39805"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-c67r-gc9j-2qf7"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-444"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{"bugzilla": {"description": "bandit: Bandit: HTTP Request Smuggling via Duplicate Content-Length Headers", "id": "2464590", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464590"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-444", "details": ["A flaw was found in Bandit, an HTTP server. This vulnerability allows for HTTP request smuggling due to the server's inconsistent handling of duplicate Content-Length headers in HTTP requests. An unauthenticated attacker can exploit this by sending a specially crafted request. If Bandit is operating behind a proxy that interprets these headers differently, the attacker can bypass security mechanisms like Web Application Firewalls (WAFs), access controls, and rate limiting, potentially leading to unauthorized actions or access."], "name": "CVE-2026-39805", "public_date": "2026-05-01T20:34:29Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-39805\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-39805\nhttps://cna.erlef.org/cves/CVE-2026-39805.html\nhttps://github.com/mtrudel/bandit/commit/f2ca636eb6df385219957e8934e9fc6efa1630d1\nhttps://github.com/mtrudel/bandit/security/advisories/GHSA-c67r-gc9j-2qf7\nhttps://osv.dev/vulnerability/EEF-CVE-2026-39805"], "statement": "This IMPORTANT HTTP request smuggling vulnerability in Bandit allows attackers to bypass security controls when the server sits behind certain proxies. Exploitation requires high complexity (specific proxy behavior) but no authentication. Impact is high to confidentiality and integrity through bypassed security mechanisms. Affects Bandit versions before 1.11.0.", "threat_severity": "Important"}

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