CVE-2026-111817

Apache Traffic Server: Dropping chunked trailers stalls a passthrough transfer until timeout

State: Published
Severity: 6.9 Medium
Published: Oct 21, 2026
Updated: Oct 23, 2026
Reserved: Oct 16, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	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	apache
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	apache

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
Apache Traffic ServerApache Software Foundation	8.1.11Affected 9.2.5 through 9.2.15Affected 10.0.0 through 10.1.4Affected 10.2.0Affected

References

https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kcvendor-advisory

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