CVE-2026-29518: RsyncProject rsync

Rsync < 3.4.3 TOCTOU Race Condition Allows Symlink-Based Arbitrary File Write

CVSS 7.3 HighEPSS 0.0015 · 4th percentile

Published by the CVE Program (CNA: VulnCheck) at 20 May 2026, 12:48 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
RsyncProject	rsync pkg:github/RsyncProject/rsync	affected before 3.4.3 semver Other versions: unaffected

Identifiers

CVE-2026-29518

CNA

VulnCheck

Weakness (CWE)

CWE-367

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.3	High	4.0	CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	CNA (VulnCheck)Used for this record
7.0	High	3.1	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	CNA (VulnCheck)
7.8	High	3.1	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H	ADP (redhat-SADP)

CISA KEV Not listed.
EPSS 0.0015, the 4th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 20 May 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/RsyncProject/rsync/pull/895/changes/8471fdd1561049ef5f58df44a1811a50bd9a531d issue-tracking
github.com/RsyncProject/rsync/releases/tag/v3.4.3 release-notes
michael.stapelberg.ch/posts/2026-05-24-minimal-memory-safe-go-rsync-vulns/ technical-description
www.vulncheck.com/advisories/rsync-toctou-race-condition-allows-symlink-based-arbitrary-file-write third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.