CVE-2026-70454

rsync < 3.5.0 TLS Certificate Validation Bypass via SSL/OpenSSL Mode

Published: Aug 13, 2026Updated: Sep 8, 2026 Sources: CVE List NVDCWE-295

8.0HIGH

Description

rsync 3.2.0 through 3.2.3 (openssl mode) and rsync-ssl through 3.4.4 (stunnel mode) contain a TLS certificate validation vulnerability that allows on-path attackers to intercept encrypted sessions by presenting self-signed or otherwise invalid certificates. Attackers can exploit the failure to validate server TLS certificates against a trusted CA or verify certificate hostname matching to decrypt or tamper with rsync session content without detection by the client.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:CScope

Changed

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

CWE-295

Affected Products

RsyncProject

oss-projectaka rsync project, rsync

rsyncLibrary

OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Collection

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References

https://github.com/RsyncProject/rsync/security/advisories/GHSA-3c3x-ww2w-5r5p

github.com

https://github.com/RsyncProject/rsync/releases/tag/v3.5.0

github.com

https://www.vulncheck.com/advisories/rsync-tls-certificate-validation-bypass-via-ssl-openssl-mode

vulncheck.com

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