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Vulnerabilities CVE-2026-43620

CVE-2026-43620

Medium
Open
TLP:CLEAR

Rsync < 3.4.3 Out-of-Bounds Array Read via recv_files()

NVD CVE.org
Critical Infrastructure

AI Analysis

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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.

Details

CVSS Score
6.9
EPSS Score
0.43%

35.7th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Confidence
90%
Published
May 20, 2026
Last Modified
Jul 14, 2026
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