What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-13 · updated 2026-10-24
• Weakness: CWE-863

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 products

• RsyncProject rsync: before 3.5.0 — fixed in 3.5.0

How to fix

Upgrade to a fixed version: RsyncProject rsync 3.5.0. Check the vendor advisory for mitigations.

References

• https://github.com/RsyncProject/rsync/releases/tag/v3.5.0
• https://github.com/RsyncProject/rsync/security/advisories/GHSA-mrc3-6cwx-hch6
• https://www.vulncheck.com/advisories/rsync-filter-rule-bypass-via-filter-merge-directive

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