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Vulnerabilities
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CVE-2026-43512

Updated on 12 May 2026

Severity

9.8 Critical severity

Details

CVSS score
9.8
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE ID
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

Versions Affected: Apache Tomcat 11.0.0-M1 to 11.0.21 Apache Tomcat 10.1.0-M1 to 10.1.54 Apache Tomcat 9.0.0.M1 to 9.0.117 Older, unsupported versions may also be affected

Description: When DIGEST authentication was configured, any user not known to the configured Realm would be authenticated if they presented the password “null”.

Mitigation: Users of the affected versions should apply one of the following mitigations:

  • Upgrade to Apache Tomcat 11.0.22 or later
  • Upgrade to Apache Tomcat 10.1.55 or later
  • Upgrade to Apache Tomcat 9.0.118 or later

Details

Affected product:
AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , Apache CXF , Apache Log4j , Apache Tapestry , Apache Tomcat , CentOS 7 ELS , Debian 10 ELS , Spring , TuxCare 9.6 ESU , Ubuntu 16.04 ELS , Ubuntu 18.04 ELS , Ubuntu 20.04 ELS , camel , grails-core , logging-flume , thrift
Affected packages:
tomcat7 @ 7.0.68 (+5213 more)

Fixes