{"id":"CVE-2025-31699","title":"Apache Traffic Server: Origin connection still owed a request body is reused, enabling request smuggling","summary":"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 r…","severity":"high","cvss":8.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L","cvssSource":"cna","cwe":["CWE-444"],"vendor":"Apache Software Foundation","product":"Apache Traffic Server","affected":["apache_traffic_server >= 8.0.0 <= 8.1.11","apache_traffic_server >= 9.0.0 <= 9.2.15","apache_traffic_server >= 10.0.0 <= 10.1.4","apache_traffic_server 10.2.0"],"published":"2026-10-21","updated":"2026-10-21","sourceUpdated":"2026-10-21T18:22:28.383Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-31699","references":[{"url":"https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc"}],"tags":["cve.org"],"ingestedAt":"2026-10-21T19:10:31.401Z","slug":"CVE-2025-31699","body":"## Overview\n\nApache 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.\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.\n\n## Affected\n\n- `apache_traffic_server >= 8.0.0 <= 8.1.11`\n- `apache_traffic_server >= 9.0.0 <= 9.2.15`\n- `apache_traffic_server >= 10.0.0 <= 10.1.4`\n- `apache_traffic_server 10.2.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":49,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}