CVE-2026-43620Patch(samba / rsync)

LOWCVSS 5.5 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch samba rsync systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories

Other references

https://github.com/RsyncProject/rsync/releases/tag/v3.4.3

Weakness type (CWE)

CWE-125

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

rsync

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
1 total mentions across 1 day

Affected systems

Vendors

samba

Products

rsync

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Patch

1100.0%

Referenced assets1 URL

By indicator

https://windowsforum.com/threads/cve-2026-43620-rsync-dos-patch-rsync-3-4-3-across-wsl-containers.420008/?utm_source=x&utm_medium=social&utm_campaign=news_node84

Full discourse1 post

WindowsForum@windowsforum137d
Patch
🪟 Rsync DoS (CVE-2026-43620) hitting rsync <3.4.3 is the reminder: your “trusted” admin file-transfer path can still faceplant. Patch WSL/containers fast—crash now, investigate later. https://windowsforum.com/threads/cve-2026-43620-rsync-dos-patch-rsync-3-4-3-across-wsl-containers.420008/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #DenialOfService #WslPatching #RsyncVulnerability #Cve202643620 https://t.co/rRwHlGOstI
Post summary
The post highlights a DoS vulnerability (CVE-2026-43620) impacting rsync versions below 3.4.3 and stresses the need for immediate patches on WSL/containers.
0000049
1.1K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	samba	rsync	-	-	-

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