Unknown [CVE-2026-65927] 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 security Apache Software Foundation advisory covers CVE-2026-65927 affecting Apache Tomcat.
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Summary
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.
- 11.0.0-M1 through 11.0.24
- 10.1.0-M1 through 10.1.57
- 9.0.0.M1 through 9.0.120.
- 8.5.0 through 8.5.100.
- through 9.0.120
- through 8.5.100
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
- 11.0.25
- 10.1.58
- 9.0.121
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121 which fix the issue.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
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