Vulnerability · Published Oct 21, 2026 · Assigned by apache

CVE-2026-111817Apache Traffic Server: Dropping chunked trailers stalls a passthrough transfer until timeout

Medium 5.3

In plain English

A medium-severity uncontrolled resource consumption in Apache Traffic Server from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.4%top 70.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	trafficserver	no fix listed	DEBIAN-CVE-2026-111817
Ubuntu:24.04:LTS	trafficserver	no fix listed	UBUNTU-CVE-2026-111817

Affected products (as reported)

Vendor	Product	Versions
Apache Software Foundation	Apache Traffic Server	8.1.119.2.5 – through 9.2.1510.0.0 – through 10.1.410.2.0

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc vendor-advisory