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Message-ID: <2289ded7-b97e-46c3-b34f-bc1effd90088@apache.org>
Date: Tue, 25 Aug 2026 22:53:59 +0100
From: Mark Thomas <markt@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-65927: Apache Tomcat: RewriteValve [N] restarts at the
second rule and may bypass access control
Severity: important
Affected versions:
- Apache Tomcat 11.0.0-M1 through 11.0.24
- Apache Tomcat 10.1.0-M1 through 10.1.57
- Apache Tomcat 9.0.0.M1 through 9.0.120
- Apache Tomcat 8.5.0 through 8.5.100
- Apache Tomcat 7.0.0 through 7.0.109 unaffected
- Apache Tomcat before 7.0.0 unaffected
Description:
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.
Credit:
4ra1n, pyn3rd and unam4 (finder)
References:
https://lists.apache.org/thread/st1dx1zyn5y7ny2s0sscmh6lrv3worr4
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-65927
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