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: 2026-10-07 13:32 UTC (History)
10 users (show)

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

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:73981 0 None None None 2026-10-01 22:11:28 UTC
Red Hat Product Errata RHSA-2026:73982 0 None None None 2026-10-01 16:24:20 UTC
Red Hat Product Errata RHSA-2026:76952 0 None None None 2026-10-07 13:32:30 UTC
Red Hat Product Errata RHSA-2026:76956 0 None None None 2026-10-07 13:31:05 UTC

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.
Comment 4 Jon Orris 2026-10-01 16:24:19 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 6.2.5

Via RHSA-2026:73982 https://access.redhat.com/errata/RHSA-2026:73982
Comment 5 Jon Orris 2026-10-01 22:11:27 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 6.2 on RHEL 10
  Red Hat JBoss Web Server 6.2 on RHEL 8
  Red Hat JBoss Web Server 6.2 on RHEL 9

Via RHSA-2026:73981 https://access.redhat.com/errata/RHSA-2026:73981
Comment 6 Jon Orris 2026-10-07 13:31:04 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 7.0.2

Via RHSA-2026:76956 https://access.redhat.com/errata/RHSA-2026:76956
Comment 7 Jon Orris 2026-10-07 13:32:29 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 7.0 on RHEL 10
  Red Hat JBoss Web Server 7.0 on RHEL 8
  Red Hat JBoss Web Server 7.0 on RHEL 9

Via RHSA-2026:76952 https://access.redhat.com/errata/RHSA-2026:76952
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