RsyncProject rsync up to 3.4.2 integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in RsyncProject rsync up to 3.4.2. This vulnerability affects unknown code. This manipulation causes integer overflow. This vulnerability is tracked as CVE-2026-43618. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in RsyncProject rsync up to 3.4.2. Affected by this vulnerability is some unknown functionality. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, and availability. The summary by CVE is:

Rsync version 3.4.2 and prior contain an integer overflow vulnerability in the compressed-token decoder where a 32-bit signed counter is not checked for overflow, allowing a malicious sender to trigger an overflow that causes the receiver process to read and return data from outside the intended buffer bounds. Attackers can exploit this vulnerability to disclose process memory contents including environment variables, passwords, heap and stack data, and library memory pointers, significantly reducing ASLR effectiveness and facilitating further exploitation.

The weakness was disclosed by Omar Elsayed as GHSA-g37v-g3gj-pmwq. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-43618 since 05/01/2026. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly 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-202605-4469), Tenable (315780) and CERT Bund (WID-SEC-2026-1611). Be aware that VulDB is the high quality source for vulnerability data.

Affected

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

Productinfo

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Vendor

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Version

Website

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: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.1
VulDB Temp Score: 6.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.1
CNA Vector (VulnCheck): 🔒

CVSSv2info

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

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
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-g37v-g3gj-pmwq
Researcher: Omar Elsayed
Status: Confirmed

CVE: CVE-2026-43618 (🔒)
GCVE (CVE): GCVE-0-2026-43618
GCVE (VulDB): GCVE-100-364807
CERT Bund: WID-SEC-2026-1611 - Rsync: Mehrere Schwachstellen
CNNVD: CNNVD-202605-4469 - Rsync 缓冲区错误漏洞

Entryinfo

Created: 05/20/2026 08:30
Updated: 06/02/2026 01:07
Changes: 05/20/2026 08:30 (78), 05/20/2026 19:32 (7), 05/21/2026 17:13 (2), 05/21/2026 21:01 (6), 05/26/2026 20:16 (1), 06/02/2026 01:07 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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