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Vulnerability record · CVE-2026-53786 · published 13 August 2026

CVE-2026-53786: Samba rsync incorrect authorization vulnerability

Samba · Rsync

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.

6.9 CVSS 4.0 Medium EPSS 0.40% · top 68.5% CWE-863 · Incorrect authorization
6.9CVSS 4.0 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
31 Aug 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/RsyncProject/rsync/releases/tag/v3.5.0 ProductRelease Notes
https://github.com/RsyncProject/rsync/security/advisories/GHSA-mrc3-6cwx-hch6 Vendor Advisory
https://www.vulncheck.com/advisories/rsync-filter-rule-bypass-via-filter-merge-directive Release NotesThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-53786), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.