Bug 2524154 (CVE-2026-65927) - CVE-2026-65927 tomcat: Apache Tomcat: Access control bypass due to off-by-one error in RewriteValve [N] flag processing
Summary: CVE-2026-65927 tomcat: Apache Tomcat: Access control bypass due to off-by-one...
Keywords:
Status: NEW
Alias: CVE-2026-65927
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:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-25 22:02 UTC by OSIDB Bzimport
Modified: 2026-08-31 17:11 UTC (History)
10 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-08-25 22:02:02 UTC 
Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule.







This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120.



The following versions were EOL at the time the CVE was created but are 
known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected.



Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121 which fix the issue.
Note You need to log in before you can comment on or make changes to this bug.