What is CVE-2026-58156?

CVE-2026-58156 is a medium-severity vulnerability in Apache Software Foundation Traffic Server, classified under Incorrect Authorization. CVSS score: 4.9/10. Published 2026-07-29.

How severe is CVE-2026-58156?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Auth bypass in Apache Software Foundation Traffic Server

CVE-2026-58156

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 8.1.9, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Apache Software Foundation Traffic Server — versions 8.0.0, 9.0.0, 10.0.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

security@apache.org (vendor-advisory)

Frequently asked questions

What is CVE-2026-58156?: CVE-2026-58156 is a medium-severity vulnerability in Apache Software Foundation Traffic Server, classified under Incorrect Authorization. CVSS score: 4.9/10. Published 2026-07-29.
How severe is CVE-2026-58156?: Medium severity. CVSS v3 base score is 4.9 out of 10.