CVE-2025-31699

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The origin then reads a later request on that connection as leftover body data, which lets an attacker smuggle requests past ATS access controls, disrupt other users' requests, or poison the cache.\n\n\n\nThis issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.\n\n\n\nUsers are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue."}, {"lang": "es", "value": "Apache Traffic Server puede devolver una conexi\u00f3n de origen al pool compartido mientras el origen a\u00fan est\u00e1 esperando el cuerpo de la solicitud que el cliente declar\u00f3 pero nunca envi\u00f3 completamente, incluso cuando el cliente utiliz\u00f3 Expect: 100-continue. El origen entonces lee una solicitud posterior en esa conexi\u00f3n como datos residuales del cuerpo, lo que permite a un atacante introducir solicitudes por delante de los controles de acceso de ATS, interrumpir las solicitudes de otros usuarios o envenenar la cach\u00e9.\\n\\nEste problema afecta a Apache Traffic Server: desde la versi\u00f3n 8.0.0 hasta la versi\u00f3n 8.1.11 incluida, desde la versi\u00f3n 9.0.0 hasta la versi\u00f3n 9.2.15 incluida, desde la versi\u00f3n 10.0.0 hasta la versi\u00f3n 10.1.4 incluida y la versi\u00f3n 10.2.0.\\n\\nSe recomienda a los usuarios actualizar a la versi\u00f3n 9.2.16, 10.1.5 o 10.2.1, que corrigen el problema."}], "id": "CVE-2025-31699", "lastModified": "2026-10-28T14:10:00.220", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 8.9, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 6.0, "source": "security@apache.org", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.1, "baseSeverity": "CRITICAL", "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": "LOW", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:L/SC:H/SI:H/SA:L/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": "LOW", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security@apache.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-31699", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-22T23:05:01.570814Z", "version": "2.0.3"}}]}, "published": "2026-10-21T19:16:47.390", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-444"}], "source": "security@apache.org", "type": "Secondary"}]}

{"bugzilla": {"description": "trafficserver: Apache Traffic Server: Origin connection still owed a request body is reused, enabling request smuggling", "id": "2558469", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2558469"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L", "status": "draft"}, "cwe": "CWE-444", "details": ["Apache Traffic Server can return an origin connection to the shared pool while the origin is still waiting on a request body the client declared but never fully sent, including when the client used Expect: 100-continue. The origin then reads a later request on that connection as leftover body data, which lets an attacker smuggle requests past ATS access controls, disrupt other users' requests, or poison the cache.\nThis issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.\nUsers are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.", "A flaw was found in Apache Traffic Server. An unauthenticated remote attacker can send a request with an incomplete body, causing an origin connection to be prematurely returned to the shared pool while the backend is still awaiting data. When a subsequent request is processed over that reused connection, the backend interprets it as leftover body data. This allows the attacker to perform HTTP request smuggling to bypass access controls, poison shared web caches, or disrupt other users' traffic."], "name": "CVE-2025-31699", "public_date": "2026-10-21T18:22:28Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-31699\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-31699\nhttps://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc"], "statement": "This vulnerability is rated as Important severity because an unauthenticated remote attacker can leverage HTTP request smuggling to circumvent proxy security boundaries, corrupt cache entries, or disrupt communications between clients and origin servers. The issue stems from premature backend connection reuse when declared client request payloads are left incomplete. However, Apache Traffic Server is not distributed or supported as a standard component in Red Hat Enterprise Linux, minimizing direct exposure across supported environments.", "threat_severity": "Important"}

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