Time-of-check Time-of-use (TOCTOU) Race Condition in Apache Tomcat - CVE-2026-80353
Published: October 20, 2026
Vulnerability identifier: #VU156279
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80353
CWE-ID: CWE-367
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to gain unauthorized access to a Unix domain socket.
The vulnerability exists due to a time-of-check time-of-use (TOCTOU) race condition in the Apache Tomcat APR/Native connector when creating Unix domain sockets and setting their permissions. A local user can exploit the timing window to access a socket without the intended authorization.
Affected software
Apache Tomcat
How to mitigate CVE-2026-80353
Install security update from vendor's website.
Apache Tomcat - update to 9.0.123