Bug 2539351 (CVE-2026-77756) - CVE-2026-77756 tomcat: Apache Tomcat: Request smuggling vulnerability can lead to denial of service
Summary: CVE-2026-77756 tomcat: Apache Tomcat: Request smuggling vulnerability can lea...
Keywords:
Status: NEW
Alias: CVE-2026-77756
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2543044
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-23 11:31 UTC by OSIDB Bzimport
Modified: 2026-09-29 10:06 UTC (History)
10 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-23 11:31:26 UTC 
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat caused by processing the transfer-encoding header for an HTTP/1.0 request may allow an attacker to cause one request from another user to fail when Tomcat is located behind a reverse proxy.



This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.47 through 9.0.121.



The following versions were EOL at the time the CVE was created but are 
known to be affected: from 8.5.67 through 8.5.100. Other unsupported versions may also be affected.



Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
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