CVE-2026-53786 rsync < 3.5.0 Filter Rule Bypass via --filter Merge Directive
Authenticated clients can bypass rsync module filter restrictions via malicious merge directives, accessing restricted files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53786?
CVE-2026-53786 is a medium-severity vulnerability in RsyncProject rsync, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
rsync before 3.5.0 contains a filter rule bypass vulnerability that allows authenticated clients to override module-level filter restrictions by supplying malicious --filter merge file directives. Attackers can inject client-side merge file directives during filter evaluation to introduce rules that supersede daemon module-level restrictions, gaining access to files the module filter was intended to exclude.
Weakness: CWE-863
Which versions are affected by CVE-2026-53786?
It affects 1 product.
Products include Samba Rsync.
How do I fix CVE-2026-53786?
Upgrade to a fixed version.
Is CVE-2026-53786 being exploited?
There is no known exploitation of CVE-2026-53786 in the wild and no public exploit code.
Other vulnerabilities in RsyncProject rsync
- CVE-2017-15994 Security feature bypass in n/a
- CVE-2026-53791 rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header
- CVE-2026-70461 rsync 3.2.5 < 3.5.0 Heap Out-of-Bounds Write via files-from Entry
- CVE-2026-70455 rsync 3.4.2 < 3.5.0 DoS via --zt Zstandard Compression Thread Exhaustion
- CVE-2026-70463 rsync 3.1.0 < 3.5.0 Authorization Bypass via auth users Directive Parsing
Sources
Also known as ALPINE-CVE-2026-53786, AZL-95822, BELL-CVE-2026-53786, DEBIAN-CVE-2026-53786, ECHO-cc28-5bd9-6cca, GHSA-mrc3-6cwx-hch6 and 1 more.