CVE-2026-58155 PUBLISHED

Apache Traffic Server: Header-name length truncation enables header aliasing and request smuggling

Assigner: apache
Reserved: 29.06.2026 Published: 29.07.2026 Updated: 29.07.2026

Apache Traffic Server truncates over-long header names, allowing header aliasing, request smuggling, and policy bypass.

This issue affects Apache Traffic Server: from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3.

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

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N
CVSS Score: 9.3

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
CVSS Score: 9.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Vendor	Apache Software Foundation
Product	Apache Traffic Server
Versions	Default: unaffected affected from 8.0.0 to 8.1.9 (incl.) affected from 9.0.0 to 9.2.14 (incl.) affected from 10.0.0 to 10.1.3 (incl.)