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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

No data.

No data.

No data.

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Vendors Products
References
Link Providers
https://github.com/RsyncProject/rsync/releases/tag/v3.4.3 cve-icon cve-icon
https://github.com/RsyncProject/rsync/security/advisories/GHSA-g37v-g3gj-pmwq cve-icon cve-icon
https://www.vulncheck.com/advisories/rsync-integer-overflow-information-disclosure cve-icon cve-icon
History

Wed, 20 May 2026 01:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Rsync < 3.4.3 Integer Overflow Information Disclosure
Weaknesses CWE-125
CWE-190
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'}

cvssV4_0

{'score': 6.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-05-20T00:50:21.416Z

Reserved: 2026-05-01T18:22:45.639Z

Link: CVE-2026-43618

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-20T02:16:36.410

Modified: 2026-05-20T02:16:36.410

Link: CVE-2026-43618

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-20T02:30:05Z