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rsync CVE-2026-70454

| EUVDEUVD-2026-58050 HIGH
Improper Certificate Validation (CWE-295)
2026-08-13 VulnCheck
Information Disclosure OpenSSL Rsync Suse
7.6
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
7.6 HIGH
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.8 MEDIUM

Network vector with high complexity reflects required on-path positioning; no privileges needed; user interaction required to initiate session; no availability impact applies.

3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
6.8 MEDIUM
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 13, 2026 - 15:44 vuln.today
Analysis Generated
Aug 13, 2026 - 15:44 vuln.today
CVE Published
Aug 13, 2026 - 14:45 cve.org
HIGH 7.6

DescriptionCVE.org

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.

AnalysisAI

TLS certificate validation bypass in rsync enables on-path attackers to intercept and tamper with encrypted file transfer sessions. Affected are rsync 3.2.0-3.2.3 in openssl mode and rsync-ssl through 3.4.4 in stunnel mode; both fail to validate server certificates against a trusted CA and perform no hostname verification, allowing a self-signed or otherwise invalid certificate to be accepted silently. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Achieve on-path network position
Delivery
Intercept outbound rsync TLS session initiation
Exploit
Present self-signed or invalid certificate to client
Execution
Client accepts certificate without validation
Persist
Establish transparent MITM proxy
Impact
Decrypt, capture, or tamper with transferred file data
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Vulnerability AssessmentAI

Exploitation Exploitation is limited to rsync deployments explicitly using TLS protection: rsync 3.2.0-3.2.3 in openssl mode or rsync-ssl through 3.4.4 in stunnel mode - standard non-TLS rsync is entirely unaffected. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N) accurately captures the threat profile: network-reachable, no privileges required, but high attack complexity reflecting the on-path positioning prerequisite, and a user-interaction requirement corresponding to an active rsync session being initiated. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with on-path network access - achieved via ARP spoofing on a shared LAN, a compromised cloud routing peer, or BGP route manipulation - intercepts an outbound rsync-ssl session as a user or automated backup job initiates a transfer. The attacker presents a self-signed certificate; because rsync performs no chain or hostname validation, the TLS handshake completes normally. …
Remediation Upgrade rsync to version 3.5.0, which the rsync project has explicitly designated a major security release to address this and related issues; the release is available at https://github.com/RsyncProject/rsync/releases/tag/v3.5.0, with full details in the NEWS file at https://download.samba.org/pub/rsync/NEWS#3.5.0. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, enumerate all systems running affected rsync versions (3.2.0-3.2.3 OpenSSL mode or rsync-ssl through 3.4.4 stunnel mode) and document which handle sensitive data transfers. …

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected
SUSE Linux Enterprise Micro 5.3 Affected

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CVE-2026-70454 vulnerability details – vuln.today
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