CVE-2026-53792

NameCVE-2026-53792
Descriptionrsync before 3.5.0 contains an out-of-bounds read vulnerability in the sender-side block matching logic that allows a malicious receiver to trigger memory access before the start of an allocated buffer by sending a crafted checksum block with a length of zero. Attackers can send a specially crafted checksum set containing a zero-length block to cause a negative offset calculation during delta computation, resulting in an out-of-bounds read of file data buffer memory on the sender side.
SourceCVE (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 PackageReleaseVersionStatus
rsync (PTS)bookworm3.2.7-1+deb12u6vulnerable
bookworm (security)3.2.7-1+deb12u5vulnerable
trixie3.4.1+ds1-5+deb13u4vulnerable
trixie (security)3.4.1+ds1-5+deb13u3vulnerable
forky, sid3.5.0+ds1-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
rsyncsource(unstable)3.5.0+ds1-1

Notes

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

Search for package or bug name: Reporting problems