Missing Authentication for Critical Function in Apache Traffic Server - CVE-2026-111815
Published: October 23, 2026
Vulnerability identifier: #VU157329
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-111815
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass client-certificate authentication and potentially access or modify protected resources.
The vulnerability exists due to missing client-certificate re-verification in Apache Traffic Server's TLS session ticket resumption when resuming a session across SNI virtual hosts. A remote attacker can resume a session established for one virtual host at another host requiring verify_client STRICT to bypass that host's client-certificate requirement and potentially access or modify protected resources.
Affected software
Apache Traffic Server
How to mitigate CVE-2026-111815
Install security update from vendor's website.
Apache Traffic Server - addressed in versions 9.2.16, 10.1.5, 10.2.1