Stack-based buffer overflow in Apache Traffic Server - CVE-2026-33930
Published: August 24, 2026
Vulnerability identifier: #VU144900
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-33930
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to stack-based buffer overflow in redirect handling when copying a client Host header into a fixed-size stack buffer. A remote attacker can send an over-long Host header to cause a denial of service.
The issue is triggered when redirect following is enabled.
Affected software
Apache Traffic Server
Fedora
trafficserver
Fedora
trafficserver
How to mitigate CVE-2026-33930
Install security update from vendor's website.
Apache Traffic Server - addressed in versions 9.2.15, 10.1.4
trafficserver - addressed in versions 9.2.15-1.el8, 9.2.15-1.el9, 10.1.4-1.fc43, 10.1.4-1.fc44
trafficserver - addressed in versions 9.2.15-1.el8, 9.2.15-1.el9, 10.1.4-1.fc43, 10.1.4-1.fc44