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CVE-2026-59083 is an improper handling of URL encoding vulnerability in Apache Tomcat's RewriteValve component. The flaw arises from incorrect processing of hex-encoded URL data, which can cause security constraints to be evaluated incorrectly in certain deployments. In affected configurations, a crafted request can bypass intended access restrictions enforced through Tomcat security constraints. Affected versions include 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. Unsupported end-of-life versions may also be affected.
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No public exploit code observed for this vulnerability.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
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.