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. This 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. Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.
History

Fri, 23 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 22 Oct 2026 00:00:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache apache Traffic Server
Apache traffic Server
Apache Software Foundation
Apache Software Foundation apache Traffic Server
Vendors & Products Apache
Apache apache Traffic Server
Apache traffic Server
Apache Software Foundation
Apache Software Foundation apache Traffic Server

Wed, 21 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Description 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. This 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. Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.
Title Apache Traffic Server: Origin connection still owed a request body is reused, enabling request smuggling
Weaknesses CWE-444
References
Metrics cvssV3_1

{'score': 8.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L'}

cvssV4_0

{'score': 9.1, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published: 2026-10-21T18:22:28.383Z

Updated: 2026-10-23T11:06:22.325Z

Reserved: 2025-04-01T00:04:31.777Z

Link: CVE-2025-31699

cve-icon Vulnrichment

Updated: 2026-10-23T11:00:46.206Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-21T19:16:47.390

Modified: 2026-10-23T12:18:04.473

Link: CVE-2025-31699

cve-icon Redhat

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