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Servers and applications

CVE-2026-59083

Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through 9.0.119, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected. Users are…

Severity
Critical 9.1
Published
14 Jul 2026
Last changed
14 Jul 2026
Added to UpHeron
21 Oct 2026
Sources
NVD

Affected software

SoftwareAffected versions
Apache TomcatServers and applications · cpe:a:apache:tomcat
  • Every version up to 8.0.0
  • From 8.5.0 up to 8.5.100
  • From 9.0.0 up to 9.0.119
  • From 10.1.0 up to 10.1.56
  • From 11.0.0 up to 11.0.23

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-59083
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-59083