CVE-2026-58156 Apache Traffic Server: URL and port parsing errors allow access-control bypass

What is CVE-2026-58156?

CVE-2026-58156 is a medium-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 mis-parses ports in URLs and userinfo, allowing port-based access-control bypass.

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-2026-58156?

It affects 1 product.

Products include Apache Traffic Server.

How do I fix CVE-2026-58156?

Upgrade to a fixed version.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-58156 being exploited?

There is no known exploitation of CVE-2026-58156 in the wild and no public exploit code.

Other vulnerabilities in Apache Traffic Server

• CVE-2014-3525 Other in n/a Critical 10.0
• CVE-2021-43082 heap-buffer-overflow with stats-over-http plugin Critical 9.8
• CVE-2021-35474 Dynamic stack buffer overflow in cachekey plugin Critical 9.8
• CVE-2019-17559 Other in Apache Traffic Server Critical 9.8
• CVE-2019-17565 Other in Apache Traffic Server Critical 9.8

All Apache Traffic Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-58156, GHSA-r6wf-4rwv-gf97, UBUNTU-CVE-2026-58156.