Use-after-free in Apache Traffic Server - CVE-2026-111804
Published: October 23, 2026
Vulnerability identifier: #VU157322
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-111804
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service and improperly modify internal statistics.
The vulnerability exists due to a use-after-free in the Apache Traffic Server experimental wasm plugin's transaction-close handler and insufficient validation of guest-supplied metric IDs when forwarding them to the internal statistics API. A remote attacker can trigger affected transaction-close processing or supply invalid guest metric IDs to cause a denial of service or improperly modify internal statistics.
Affected software
Apache Traffic Server
How to mitigate CVE-2026-111804
Install security update from vendor's website.
Apache Traffic Server - addressed in versions 9.2.16, 10.1.5, 10.2.1