| 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, 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)
[bullseye] - rsync <postponed> (Minor issue, 1-byte zero OOB write)
https://download.samba.org/pub/rsync/NEWS#3.4.3
https://www.openwall.com/lists/oss-security/2026/05/20/6
https://github.com/RsyncProject/rsync/security/advisories/GHSA-8f85-j2cv-59m8
Fixed by: https://github.com/RsyncProject/rsync/commit/a5fc5ebe7a8ef1aa72f6e344599f97fd4427ecba (v3.4.3)