CVE-2026-59083
Apache Tomcat: Incorrect URL decoding in RewriteValve may allow security control bypass
9.1
CRITICAL
CVSS 3.1
EPSS 0.38%
Description
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 through 11.0.23, from 10.1.0 through 10.1.56, from 9.0.0 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 recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.
How to fix CVE-2026-59083
To remediate CVE-2026-59083, upgrade the affected package to a fixed version below.
- —upgrade to 9.0.120 or later
- —no fix listed
- —no fix listed
- —upgrade to 9.0.70-2 or later
Is CVE-2026-59083 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 9.0.120, >= 10.1.0, < 10.1.57, >= 11.0.0, < 11.0.24
- from 0
- from 0
- from 0, < 9.0.70-2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |