Improper input validation in Apache Traffic Server
CVE-2026-33267
Improper Input Validation vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.2.0 through 9.2.14, from 10.1.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fixes the issue.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.004 (30.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N.
Affected products
- Apache Traffic_server
- Apache Software Foundation Traffic Server — versions 9.2.0, 10.1.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-33267?
- CVE-2026-33267 is a critical-severity vulnerability in Apache Traffic Server, classified under Improper Input Validation. CVSS score: 10.0/10. Published 2026-07-29.
- How severe is CVE-2026-33267?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2026-33267 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.