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

🗓️ 21 May 2026 08:02:04Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 23 Views

Rsync older than 3.4.3 has a time of check to time of use race condition enabling symlink based file writes.

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Detection
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attackerkb
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Rocky Linux 9.2 [CIQ] Security Update: rsync / rsync-daemon / rsync-debuginfo / rsync-debugsource / etc Multiple Vulnerabilities (ciqsa-2026_1364)
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Rocky Linux 9.4 [CIQ] Security Update: rsync / rsync-daemon / rsync-debuginfo / rsync-debugsource / etc Multiple Vulnerabilities (ciqsa-2026_1363)
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23 May 2026 08:38Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.17 - 7.8
CVSS 47.3
EPSS0.0014
SSVC
23