CVE-2026-58159 Apache Traffic Server: Listener and ACL handling allow access-control bypass
Attackers can bypass IP access controls on UDS listeners and ACL matching in Apache Traffic Server, requiring an upgrade to secure the server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-58159?
CVE-2026-58159 is a high-severity authentication bypass vulnerability in Apache Traffic Server, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Apache Traffic Server can bypass IP access controls on UDS listeners and through ACL matching errors.
This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-58159?
It affects 1 product.
Products include Apache Traffic Server.
How do I fix CVE-2026-58159?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-58159 being exploited?
There is no known exploitation of CVE-2026-58159 in the wild and no public exploit code.
Other vulnerabilities in Apache Traffic Server
Sources
Also known as DEBIAN-CVE-2026-58159, GHSA-vv89-hv6r-vgqh, UBUNTU-CVE-2026-58159.