Staging Environment: Content and features may be unstable or change without notice.
Advisory details: gitlab / maven/org.apache.tomcat.embed/tomcat-embed-core/CVE-2026-59083
Advisory ID gitlab/maven/org.apache.tomcat.embed/tomcat-embed-core/CVE-2026-59083
Aliases CVE-2026-59083
GHSA-hcjr-322h-429r
Summary Apache Tomcat - Incorrect URL decoding in RewriteValve may allow security control bypass 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. Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (3)
CWE-177 Improper Handling of URL Encoding (Hex Encoding)
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3.1 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.apache.tomcat.embed/tomcat-embed-core/CVE-2026-59083.yml
Reference id Reference type URL
https://github.com/apache/tomcat/commit/f00ab28725a18c7fffda421e9858c27badcac1e4
https://lists.apache.org/thread/3g63zos2gkjo5vgnrk8kxmosv47w6wbq
https://tomcat.apache.org/security-10.html
https://tomcat.apache.org/security-11.html
https://tomcat.apache.org/security-9.html
http://www.openwall.com/lists/oss-security/2026/07/14/7
CVE-2026-59083 https://nvd.nist.gov/vuln/detail/CVE-2026-59083
GHSA-hcjr-322h-429r https://github.com/advisories/GHSA-hcjr-322h-429r
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.apache.tomcat.embed/tomcat-embed-core/CVE-2026-59083.yml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.