Staging Environment: Content and features may be unstable or change without notice.
Advisory details: gitlab / maven/org.apache.tomcat.embed/tomcat-embed-core/CVE-2026-34500
Advisory ID gitlab/maven/org.apache.tomcat.embed/tomcat-embed-core/CVE-2026-34500
Aliases CVE-2026-34500
GHSA-24j9-x2wg-9qv6
Summary Apache Tomcat: CLIENT_CERT authentication does not fail as expected CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled and FFM is used in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.20, from 10.1.22 through 10.1.53, from 9.0.92 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fixes 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-287 Improper Authentication
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-2026-34500.yml
Reference id Reference type URL
https://github.com/apache/tomcat
7rcl4zdxryc8hy3htyfyxkbqpxjtfdl2 Advisory https://lists.apache.org/thread/7rcl4zdxryc8hy3htyfyxkbqpxjtfdl2
CVE-2026-34500 https://nvd.nist.gov/vuln/detail/CVE-2026-34500
GHSA-24j9-x2wg-9qv6 https://github.com/advisories/GHSA-24j9-x2wg-9qv6
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:H/PR:N/UI:N/S:U/C:H/I:L/A:N Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.apache.tomcat.embed/tomcat-embed-core/CVE-2026-34500.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

Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-10T14:21:50Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/34xxx/CVE-2026-34500.json

Source Advisory: vulnrichment/CVE-2026-34500

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]