Authentication Bypass Issues in Apache Tomcat
CVE-2026-43512

9.8CRITICAL

Key Information:

Vendor

Apache
Status
Apache Tomcat
Vendor
CVE Published:
12 May 2026

What is CVE-2026-43512?

The authentication bypass vulnerability in the digest authentication mechanism of Apache Tomcat poses a significant risk. It affects various versions, allowing unauthorized users to gain access under certain conditions. Users operating versions from 11.0.0-M1 to 11.0.21, 10.1.0-M1 to 10.1.54, and several older releases should take immediate action. It is strongly advised to upgrade to secure versions 11.0.22, 10.1.55, or 9.0.118 to safeguard against potential exploits associated with this vulnerability.

Affected Version(s)

Apache Tomcat 11.0.0-M1 <= 11.0.21

Apache Tomcat 10.1.0-M1 <= 10.1.54

Apache Tomcat 9.0.0.M1 <= 9.0.117

References

https://lists.apache.org/thread/7x09x7o12solvclslw3sz0288...
vendor-advisory

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.