Resource exhaustion in Apache Traffic Server - CVE-2026-59173

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Main Vulnerability Database Vulnerabilities #VU145206

Resource exhaustion in Apache Traffic Server - CVE-2026-59173

Published: August 25, 2026


Vulnerability identifier: #VU145206
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-2026-59173
CWE-ID: CWE-400
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 improper flow-control handling in the HTTP/2 implementation when processing stalled flow-control conditions. A remote attacker can send HTTP/2 traffic that triggers stalled flow-control conditions to cause a denial of service.


Affected software

Apache Traffic Server
Fedora
openEuler
trafficserver
trafficserver-perl
trafficserver-devel
trafficserver-debugsource
trafficserver-debuginfo

How to mitigate CVE-2026-59173

Install security update from vendor's website.

Apache Traffic Server - addressed in versions 9.2.14, 10.1.3
trafficserver - addressed in versions 9.2.14-1.el8, 9.2.14-1.el9, 10.1.3-1.fc43, 10.1.3-1.fc44
trafficserver-perl - update to 9.2.15-1
trafficserver-devel - update to 9.2.15-1
trafficserver-debugsource - update to 9.2.15-1
trafficserver-debuginfo - update to 9.2.15-1
trafficserver - update to 9.2.15-1

External References

Related Security Bulletins