Bug 2558464 (CVE-2025-55702) - CVE-2025-55702 trafficserver: Apache Traffic Server: HTTP request smuggling via unread POST request body
Summary: CVE-2025-55702 trafficserver: Apache Traffic Server: HTTP request smuggling v...
Keywords:
Status: NEW
Alias: CVE-2025-55702
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2562329 2562331
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-21 18:36 UTC by OSIDB Bzimport
Modified: 2026-10-27 18:58 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-10-21 18:36:14 UTC 
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.
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