RsyncProject rsync up to 3.4.2 receiver.c recv_files out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability was found in RsyncProject rsync up to 3.4.2 and classified as problematic. Affected by this issue is the function recv_files of the file receiver.c. Executing a manipulation can lead to out-of-bounds. This vulnerability is handled as CVE-2026-43620. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in RsyncProject rsync up to 3.4.2. This vulnerability affects the function recv_files of the file receiver.c. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The weakness was released by Pratham Gupta as GHSA-28pw-r563-rxvm. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-43620 since 05/01/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 315780 (Debian dla-4591 : rsync - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.4.3 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the databases at CNNVD (CNNVD-202605-4467), Tenable (315780) and CERT Bund (WID-SEC-2026-1611). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • Fedora Linux
  • Ubuntu Linux
  • SUSE Linux
  • Open Source Rsync
  • SUSE openSUSE

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.4

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CNA Base Score: 6.5
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 315780
Nessus Name: Debian dla-4591 : rsync - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: rsync 3.4.3

Timelineinfo

05/01/2026 CVE reserved
05/20/2026 +19 days Advisory disclosed
05/20/2026 +0 days VulDB entry created
06/02/2026 +12 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-28pw-r563-rxvm
Researcher: Pratham Gupta
Status: Confirmed

CVE: CVE-2026-43620 (🔒)
GCVE (CVE): GCVE-0-2026-43620
GCVE (VulDB): GCVE-100-364816
CERT Bund: WID-SEC-2026-1611 - Rsync: Mehrere Schwachstellen
CNNVD: CNNVD-202605-4467 - Rsync 缓冲区错误漏洞

Entryinfo

Created: 05/20/2026 08:32
Updated: 06/02/2026 01:25
Changes: 05/20/2026 08:32 (81), 05/20/2026 19:32 (7), 05/21/2026 18:16 (2), 05/21/2026 21:53 (6), 05/23/2026 21:04 (10), 05/26/2026 20:34 (1), 06/02/2026 01:25 (1)
Complete: 🔍
Cache ID: 216::103

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