CVE-2026-111817 is a vulnerability in Apache Traffic Server
Published on October 21, 2026
Apache Traffic Server: Dropping chunked trailers stalls a passthrough transfer until timeout
Apache Traffic Server can stall a chunked transfer that it passes through with its trailers removed (proxy.config.http.drop_chunked_trailers) until the connection times out, because it waits for the trailer bytes it has already dropped. Trailer dropping is on by default in 10.x. In 8.1.11 and 9.2.x it is off by default, and those versions are affected only if it is enabled.
This issue affects Apache Traffic Server: 8.1.11, from 9.2.5 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.
Users are recommended to upgrade to version 10.1.5 or 10.2.1, which fix the issue.
Vulnerability Analysis
CVE-2026-111817 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a small impact on availability.
Weakness Type
What is a Resource Exhaustion Vulnerability?
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
CVE-2026-111817 has been classified to as a Resource Exhaustion vulnerability or weakness.
Products Associated with CVE-2026-111817
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Affected Versions
Apache Software Foundation Apache Traffic Server:- Version 8.1.11 is affected.
- Version 9.2.5, <= 9.2.15 is affected.
- Version 10.0.0, <= 10.1.4 is affected.
- Version 10.2.0 is affected.