CVE-2026-66066

Name	CVE-2026-66066
Description	Action Pack is a framework for handling and responding to web requests. In versions prior to 7.2.3.2, 8.0.5.1 and 8.1.3.1, Active Storage does not disable libvips operations marked unsafe for untrusted content, allowing a crafted upload to invoke such an operation. Consuming applications are affected when configured to use libvips and accept image uploads from untrusted users. An unauthenticated attacker may exploit this behavior to read arbitrary files accessible to the Rails process, including environment variables and application secrets. Exposure of credentials such as secret_key_base or external-service tokens may enable remote code execution or lateral movement. This issue has been fixed in versions 7.2.3.2, 8.0.5.1 and 8.1.3.1.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1143080

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
rails (PTS)	bullseye	2:6.0.3.7+dfsg-2+deb11u2	vulnerable
	bullseye (security)	2:6.0.3.7+dfsg-2+deb11u5	vulnerable
	bookworm, bookworm (security)	2:6.1.7.10+dfsg-1~deb12u2	vulnerable
	trixie, trixie (security)	2:7.2.2.2+dfsg-2~deb13u1	vulnerable
	forky, sid	2:7.2.3.2+dfsg-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
rails	source	(unstable)	2:7.2.3.2+dfsg-1			1143080

Notes

https://github.com/rails/rails/security/advisories/GHSA-xr9x-r78c-5hrm
Fixed by: https://github.com/rails/rails/commit/d79b7f4aa17dec8ce4960fef05733c8c0c7ef49a (v7.2.3.2)
https://discuss.rubyonrails.org/t/cve-2026-66066-attack-details-and-tools-to-perform-a-forensic-investigation/91441
https://github.com/rails/rails-forensics-CVE-2026-66066