CVE-2026-33267

Apache Traffic Server: Untrusted @ headers can spoof ATS internal metadata

State: Published
Severity: 7.7 High
Published: Jul 29, 2026
Updated: Jul 30, 2026
Reserved: Mar 18, 2026

Description

Improper Input Validation vulnerability in Apache Traffic Server.

This issue affects Apache Traffic Server: from 9.2.0 through 9.2.14, from 10.1.0 through 10.1.3.

Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fixes the issue.

Scores

CVSS	Score	Vector	Source
4.0	7.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N	apache
3.1	10.0 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N	apache

Weaknesses

CWE-20 Improper Input Validation

Affected Products

Product	Versions
Apache Traffic ServerApache Software Foundation	9.2.0 through 9.2.14Affected 10.1.0 through 10.1.3Affected

References

https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6dvendor-advisory

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