CVE-2026-39805

{"id": "CVE-2026-39805", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-39805", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-02T01:20:49.825555Z"}}], "cvssMetricV40": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "affectedData": [{"cpes": ["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"], "repo": "https://github.com/mtrudel/bandit", "vendor": "mtrudel", "modules": ["'Elixir.Bandit.Headers'"], "product": "bandit", "versions": [{"status": "affected", "version": "0.1.0", "lessThan": "1.11.0", "versionType": "semver"}], "packageURL": "pkg:hex/bandit", "packageName": "bandit", "programFiles": ["lib/bandit/headers.ex"], "collectionURL": "https://repo.hex.pm", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.Bandit.Headers':get_content_length/1"}]}, {"cpes": ["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"], "repo": "https://github.com/mtrudel/bandit", "vendor": "mtrudel", "modules": ["'Elixir.Bandit.Headers'"], "product": "bandit", "versions": [{"status": "affected", "version": "7bc8d97cd22697c299baa8012b7f419a7606a80c", "lessThan": "f2ca636eb6df385219957e8934e9fc6efa1630d1", "versionType": "git"}], "packageURL": "pkg:github/mtrudel/bandit", "packageName": "mtrudel/bandit", "programFiles": ["lib/bandit/headers.ex"], "collectionURL": "https://github.com", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.Bandit.Headers':get_content_length/1"}]}]}], "published": "2026-05-01T21:16:17.037", "references": [{"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": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-c67r-gc9j-2qf7", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "description": [{"lang": "en", "value": "CWE-444"}]}], "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."}], "lastModified": "2026-10-26T22:10:00.163", "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}