Improper control of a resource through its lifetime in Apache Traffic Server - CVE-2026-111817
Published: October 23, 2026
Vulnerability identifier: #VU157334
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-111817
CWE-ID: CWE-664
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service by stalling chunked transfers until connection timeout.
The vulnerability exists due to incorrect transfer-state tracking in Apache Traffic Server's chunked passthrough handling when proxy.config.http.drop_chunked_trailers removes trailer bytes that the transfer logic continues waiting for. A remote attacker can trigger processing of a chunked transfer containing trailers to stall the transfer until timeout and degrade service availability.
Trailer dropping is enabled by default in 10.x; in 9.2.x, exploitation requires explicitly enabling it.
Affected software
Apache Traffic Server
How to mitigate CVE-2026-111817
Install security update from vendor's website.
Apache Traffic Server - addressed in versions 9.2.16, 10.1.5, 10.2.1