[SECURITY] CVE-2026-80353 Apache Tomcat - TOCTOU when setting specific permissions for Unix Domain Sockets - Fix for CVE-2026-65183 did not address APR connector

[Mark Thomas <ma...@apache.org>]

CVE-2026-80353 Apache Tomcat - TOCTOU when setting specific permissions 
for Unix Domain Sockets - Fix for CVE-2026-65183 did not address APR 
connector

Severity: Low

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 9.0.47 to 9.0.122

Description:
Time-of-check time-of-use (TOCTOU) race condition vulnerability in 
Apache Tomcat when creating unix domain sockets for the APR/Native 
connector allows an unauthorised local user to access the unix domain 
socket. The fix for CVE-2026-65183 only addressed the NIO connector. It 
did not address the same issue in the APR/Native connector.

Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 9.0.123

Credit:
This issue was identified by:
- h1ei1

History:
2026-10-20 Original advisory

References:
[1] https://tomcat.apache.org/security-9.html














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