CVE-2026-53791

Name	CVE-2026-53791
Description	rsync daemon before 3.5.0 contains an IP address spoofing vulnerability that allows unauthenticated remote attackers to bypass IP-based access controls by sending a crafted PROXY protocol header with a forged source address. Attackers who can connect directly to the rsync daemon can inject a spoofed source IP in the PROXY protocol header to circumvent hosts allow/deny rules, gaining unauthorized access that would otherwise be blocked based on their real source address.
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
rsync (PTS)	bookworm	3.2.7-1+deb12u6	vulnerable
	bookworm (security)	3.2.7-1+deb12u5	vulnerable
	trixie	3.4.1+ds1-5+deb13u4	vulnerable
	trixie (security)	3.4.1+ds1-5+deb13u3	vulnerable
	forky, sid	3.5.0+ds1-2	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
rsync	source	(unstable)	3.5.0+ds1-1

https://download.samba.org/pub/rsync/NEWS#3.5.0