CVE-2026-111816

Apache Traffic Server: A malformed 302 response bypasses parse-error rejection through the Transfer-Encoding: chunked carve-out

State: Published
Severity: 9.2 Critical
Published: Oct 21, 2026
Updated: Oct 23, 2026
Reserved: Oct 16, 2026

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Description

Apache Traffic Server forwarded a malformed 302 response that should have been rejected as a parse error, because the Transfer-Encoding: chunked carve-out bypassed the rejection path. A response that two peers can read differently is then stored and served, allowing cache poisoning and response-framing desync.

This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.

Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.

Scores

CVSS	Score	Vector	Source
4.0	9.2 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N	apache
3.1	9.3 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N	apache

Weaknesses

CWE-444 Inconsistent Interpretation of HTTP Requests

Affected Products

Product	Versions
Apache Traffic ServerApache Software Foundation	8.0.0 through 8.1.11Affected 9.0.0 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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