This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-53791 →

DEBIAN-CVE-2026-53791

rsync daemon before 3.5.0 contains an IP address spoofing vulnerability that allows unauthenticated remote attackers to bypass IP-based access control...

Original description

The description as published by the source.

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: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 rsync

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 rsync

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.0+ds1-0+deb13u1"}]}]

Debian:14 rsync

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.0+ds1-1"}]}]

References

advisory security-tracker.debian.org