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Vulnerability · Published Aug 13, 2026 · Assigned by VulnCheck

CVE-2026-53786rsync < 3.5.0 Filter Rule Bypass via --filter Merge Directive

Medium 6.5

In plain English

A medium-severity incorrect authorization in rsync from RsyncProject. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 65.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.21rsync3.5.0-r0ALPINE-CVE-2026-53786
Alpine:v3.22rsync3.5.0-r0ALPINE-CVE-2026-53786
Alpine:v3.23rsync3.5.0-r0ALPINE-CVE-2026-53786
Alpine:v3.24rsync3.5.0-r0ALPINE-CVE-2026-53786
Debian:12rsyncno fix listedDEBIAN-CVE-2026-53786
Debian:13rsync3.5.0+ds1-0+deb13u1DEBIAN-CVE-2026-53786
Debian:14rsync3.5.0+ds1-1DEBIAN-CVE-2026-53786
Ubuntu:22.04:LTSrsyncno fix listedUBUNTU-CVE-2026-53786
Ubuntu:24.04:LTSrsyncno fix listedUBUNTU-CVE-2026-53786
Ubuntu:26.04:LTSrsyncno fix listedUBUNTU-CVE-2026-53786
Ubuntu:26.10rsyncno fix listedUBUNTU-CVE-2026-53786

Affected products (as reported)

VendorProductVersions
RsyncProject rsync 0 – through 3.4.4

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References