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CVE-2026-65927 is an off-by-one error in Apache Tomcat's RewriteValve handling of the [N] rewrite flag. When this flag restarts rewrite processing, Tomcat resumes evaluation at the second rewrite rule rather than the first. This can skip rewrite logic, including access-control checks, that must be reevaluated at the first rule. Affected releases are Tomcat 11.0.0-M1 through 11.0.24, 10.1.0-M1 through 10.1.57, and 9.0.0.M1 through 9.0.120. End-of-life Tomcat 8.5.0 through 8.5.100 is also known to be affected.
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An Apache Tomcat RewriteValve rule-processing flaw that may permit access-control bypasses when using the [N] flag.
A Tomcat RewriteValve rule-processing flaw that may bypass access controls when using the [N] flag.
An off-by-one error vulnerability in Apache Tomcat. Fixed by upgrading to 9.0.121 or later, 10.1.59 or later, or 11.0.25 or later.
An Apache Tomcat RewriteValve off-by-one flaw that can enable access-control bypass through crafted rewrite rules.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
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