Unauthenticated RCE in Apache Traffic Server's magick plugin with CVSS 10.0 affecting widely-used web caching/reverse-proxy software; high-impact infrastructure risk requiring org-wide notice.
CVE-2026-111813
Unauthenticated argument injection in ATS magick plugin enabling RCE.
Is CVE-2026-111813 being exploited?
Not confirmed. CVE-2026-111813 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.49% probability of exploitation in the next 30 days.
How severe is CVE-2026-111813?
CVE-2026-111813 is rated Critical with a CVSS score of 10.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-111813?
Yes. A fix has been recorded for CVE-2026-111813. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-111813 affect?
CVE-2026-111813 affects Apache Traffic Server magick plugin (default unsigned), Apache Traffic Server 8.0.1-8.1.11, Apache Traffic Server 9.0.0-9.2.15, Apache Traffic Server 10.0.0-10.1.4, and 2 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-111813?
Upgrade to 9.2.16, 10.1.5, or 10.2.1 immediately; disable magick plugin until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker can control ImageMagick convert args via ATS magick plugin, enabling remote code execution and file access.
Immediate action required
- affected>= 8.0.1 and <= 8.1.11
- affected>= 9.0.0 and <= 9.2.15
- affected>= 10.0.0 and <= 10.1.4
- affected10.2.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.