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Description

Rsync version 3.4.2 and prior contain a receiver-side out-of-bounds array read vulnerability in recv_files() in receiver.c that allows a malicious rsync server to crash the rsync client process. Attackers can exploit the vulnerability by setting CF_INC_RECURSE in compatibility flags and sending a specially crafted file list where the first sorted entry is not the leading dot directory, followed by a transfer record with ndx=0 and an iflag word without ITEM_TRANSFER, causing the receiver to read 8 bytes before the allocated pointer array and dereference an invalid pointer at an unmapped address, resulting in a deterministic SIGSEGV crash of the rsync client.

PUBLISHED Reserved 2026-05-01 | Published 2026-05-20 | Updated 2026-05-20 | Assigner VulnCheck




MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Problem types

Out-of-bounds Read

Product status

Default status
unaffected

Any version before 3.4.3
affected

Credits

Pratham Gupta (@prathamgupta36) finder

References

github.com/.../rsync/security/advisories/GHSA-28pw-r563-rxvm vendor-advisory

github.com/RsyncProject/rsync/releases/tag/v3.4.3 release-notes

www.vulncheck.com/...out-of-bounds-array-read-via-recv-files third-party-advisory

cve.org (CVE-2026-43620)

nvd.nist.gov (CVE-2026-43620)

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