Authentication Flaw in Apache Tomcat and Tomcat Native Software
CVE-2026-29145

9.1CRITICAL

Key Information:

Vendor

Apache
Status
Apache Tomcat
Apache Tomcat Native
Vendor
CVE Published:
9 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-29145?

An authentication flaw exists in Apache Tomcat and Apache Tomcat Native, where the CLIENT_CERT authentication process does not fail as expected under certain configurations when soft fail is disabled. This vulnerability potentially allows unauthorized access in scenarios where proper validation is critical. Users are urged to upgrade to the latest secured versions to mitigate this risk and ensure the integrity of their authentication mechanisms.

Affected Version(s)

Apache Tomcat 11.0.0-M1 <= 11.0.18

Apache Tomcat 10.1.0-M7 <= 10.1.52

Apache Tomcat 9.0.83 <= 9.0.115

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-29145-Tester
Created by sancliffe

References

https://lists.apache.org/thread/yz5fxmhd2j43wgqykssdo7klt...
vendor-advisory

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

gregk4sec (https://github.com/gregk4sec)
.