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CVE-2026-59083 is an improper handling of URL encoding vulnerability in Apache Tomcat's RewriteValve component. Incorrect decoding of hex-encoded characters during URI rewriting can cause rewritten requests to be interpreted differently than intended, which may allow security constraints to be bypassed in affected configurations. The issue affects Apache Tomcat 11.0.0-M1 through 11.0.23, 10.1.0-M1 through 10.1.56, 9.0.0.M1 through 9.0.119, and 8.5.0 through 8.5.100. Other end-of-support versions may also be affected.
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A security constraint bypass vulnerability in Apache Tomcat's rewrite valve caused by improper handling of URL hex encoding.
A low-severity Apache Tomcat vulnerability in RewriteValve where incorrect URL decoding in rewritten URIs may allow security control bypass in some configurations.
An Apache Tomcat RewriteValve vulnerability involving incorrect URL decoding / improper handling of hex-encoded URL data that may allow security constraint bypass in some configurations.
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Every observed campaign linking this CVE to a named adversary.
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YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.