CVE-2026-57211

Name	CVE-2026-57211
Description	RabbitMQ is a messaging and streaming broker. Prior to 4.1.11 and 4.2.6 on Windows, the RabbitMQ management plugin static file handler rabbit_mgmt_wm_static can pass URL-encoded backslashes to erl_prim_loader:read_file_info before path validation when multiple management extension plugins are enabled, causing outbound DNS and SMB requests to attacker-controlled UNC paths. This issue is fixed in versions 4.1.11 and 4.2.6.
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)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
rabbitmq-server (PTS)	bullseye (security), bullseye	3.8.9-3+deb11u1	fixed
	bookworm, bookworm (security)	3.10.8-1.1+deb12u1	fixed
	trixie	4.0.5-6+deb13u2	fixed
	forky, sid	4.3.2-4	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
rabbitmq-server	source	(unstable)	(not affected)

- rabbitmq-server <not-affected> (Only affects RabbitMQ on Windows)