Dashboard / CVE-2026-43620

CVE-2026-43620

MEDIUM
MEDIUM Priority: 0.03 BB Relevance: 64/100
Published: 2026-05-20 Modified: 2026-11-08 First seen: 2026-11-08 Status: active

Attack Surface

Network Low Complexity No Auth

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: Active
AT: None
VC: None
VI: None
VA: High

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
RsyncProject rsync 0 < 3.4.3

References & Advisories (3)

Bug Bounty Relevance

64 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity

CVSS Score

6.9 / 10.0 v4.0
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

EPSS — Exploitation Probability

0.43%
Raw Score 0.004280
Percentile 37.5%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00428
2026-11-12
0.00428
2026-11-10
0.00428
2026-11-09
0.00428
2026-11-08
0.00428

Intelligence Sources

mitre ref →

External Links