When a client sends a POST with Expect: 100-continue and the origin answers before reading the body, Apache Traffic Server parses the unread body left on the client connection as the next request. An attacker behind a front-end proxy that shares connections to Traffic Server can use this to smuggle requests past the front end and desynchronize responses for other users. 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 When a client sends a POST with Expect: 100-continue and the origin answers before reading the body, Apache Traffic Server parses the unread body left on the client connection as the next request. An attacker behind a front-end proxy that shares connections to Traffic Server can use this to smuggle requests past the front end and desynchronize responses for other users. 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: An unread Expect: 100-continue request body is framed as a new request
Weaknesses CWE-444
References
Metrics cvssV3_1

{'score': 8.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N'}

cvssV4_0

{'score': 7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published: 2026-10-21T18:24:21.377Z

Updated: 2026-10-23T11:06:22.172Z

Reserved: 2025-08-13T22:27:49.065Z

Link: CVE-2025-55702

cve-icon Vulnrichment

Updated: 2026-10-23T11:00:44.610Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-21T19:16:48.120

Modified: 2026-10-23T12:18:05.570

Link: CVE-2025-55702

cve-icon Redhat

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