CVE-2026-45232

Name	CVE-2026-45232
Description	Rsync versions before 3.4.3 contain an off-by-one out-of-bounds stack write vulnerability in the establish_proxy_connection() function in socket.c that allows network attackers to corrupt stack memory by sending a malformed HTTP proxy response. Attackers can exploit this by positioning themselves between the client and proxy or controlling the proxy server to send a response line of 1023 or more bytes without a newline terminator, causing a null byte to be written to an out-of-bounds stack address when the RSYNC_PROXY environment variable is set.
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)	bullseye	3.2.3-4+deb11u1	vulnerable
	bullseye (security)	3.2.3-4+deb11u4	vulnerable
	bookworm	3.2.7-1+deb12u4	vulnerable
	bookworm (security)	3.2.7-1+deb12u5	vulnerable
	trixie	3.4.1+ds1-5+deb13u2	vulnerable
	trixie (security)	3.4.1+ds1-5+deb13u3	vulnerable
	forky	3.4.2+ds1-2	vulnerable
	sid	3.4.3+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)	3.4.3+ds1-1

Notes

[trixie] - rsync <no-dsa> (Minor issue)
[bookworm] - rsync <no-dsa> (Minor issue)
https://download.samba.org/pub/rsync/NEWS#3.4.3
https://www.openwall.com/lists/oss-security/2026/05/20/6