CVE-2026-43620
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
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OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 3.2.7-1+deb12u5 |
| debian | bullseye | fixed | 3.2.3-4+deb11u4 |
| debian | forky | fixed | 3.4.3+ds1-1 |
| debian | sid | fixed | 3.4.3+ds1-1 |
| debian | trixie | fixed | 3.4.1+ds1-5+deb13u3 |
| windows | affected | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| samba | rsync | {"endIncluding":"3.4.2"} | |
References
- https://github.com/RsyncProject/rsync/releases/tag/v3.4.3
- https://github.com/RsyncProject/rsync/security/advisories/GHSA-28pw-r563-rxvm
- https://www.vulncheck.com/advisories/rsync-out-of-bounds-array-read-via-recv-files
- https://www.suse.com/security/cve/CVE-2026-43620.html
- https://security-tracker.debian.org/tracker/CVE-2026-43620
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43620
CWEs
CWE-125
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.