What is CVE-2026-41920?

CVE-2026-41920 is a critical-severity vulnerability in Apache Traffic Server, classified under Improper Access Control. CVSS score: 9.3/10. Published 2026-07-29.

How severe is CVE-2026-41920?

Critical severity. CVSS v3 base score is 9.3 out of 10.

Vulnerability in Apache Traffic Server

CVE-2026-41920

Improper Access Control vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.0.0 through 9.1.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.1.15 or 10.1.4, which fixes the issue.

EPSS: 0.003 (23.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N.

Affected products

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

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)

Frequently asked questions

What is CVE-2026-41920?: CVE-2026-41920 is a critical-severity vulnerability in Apache Traffic Server, classified under Improper Access Control. CVSS score: 9.3/10. Published 2026-07-29.
How severe is CVE-2026-41920?: Critical severity. CVSS v3 base score is 9.3 out of 10.