What is CVE-2026-59173?

CVE-2026-59173 is a high-severity vulnerability in Apache Traffic Server, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-07-18.

How severe is CVE-2026-59173?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Apache Traffic Server

CVE-2026-59173

Uncontrolled Resource Consumption vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.0.0 through 9.1.13, from 10.0.0 through 10.1.2. Users are recommended to upgrade to version 9.1.14 or 10.1.3, which fixes the issue.

Vulnerability class: DoS (Denial of Service)

EPSS: 0.007 (50.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

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

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-59173?: CVE-2026-59173 is a high-severity vulnerability in Apache Traffic Server, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-07-18.
How severe is CVE-2026-59173?: High severity. CVSS v3 base score is 7.5 out of 10.