Incorrect authorization in Apache Traffic Server - CVE-2026-111814
Published: October 23, 2026
Vulnerability identifier: #VU157328
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-2026-111814
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause requests to use an unintended client-certificate identity at the origin, potentially gaining unauthorized access to or modifying protected resources.
The vulnerability exists due to insufficient client-certificate identity matching in Apache Traffic Server's default outbound session-sharing policy when reusing pooled TLS sessions. A remote attacker can trigger a transaction configured for one client certificate that instead reuses a session authenticated with another certificate to access origin resources under the unintended identity.
The default server_session_sharing.match setting omits MASK_CERT.
Affected software
Apache Traffic Server
How to mitigate CVE-2026-111814
Install security update from vendor's website.
Apache Traffic Server - addressed in versions 9.2.16, 10.1.5, 10.2.1