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rsync CVE-2026-70454

| EUVDEUVD-2026-58050 HIGH
Improper Certificate Validation (CWE-295)
2026-08-13 VulnCheck
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
Red Hat
6.8 MEDIUM
qualitative

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

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. No public exploit has been identified at time of analysis, and a vendor-released patch (v3.5.0, designated a major security release) is available.

Technical ContextAI

rsync is a ubiquitous file-synchronization utility. When operated in TLS-protected modes - openssl mode (rsync 3.2.0-3.2.3) or stunnel mode via rsync-ssl (through 3.4.4) - the client performs no certificate chain validation against a trusted CA and no hostname verification against the certificate's Common Name or Subject Alternative Names. This falls squarely under CWE-295 (Improper Certificate Validation), a class of flaw where TLS is nominally in use but its trust guarantees are entirely absent: an attacker presenting any certificate, including a self-signed one, will have it accepted. The CPE cpe:2.3:a:rsyncproject:rsync:*:*:*:*:*:*:*:* covers the rsync project's upstream releases. The two distinct affected code paths (openssl mode vs. stunnel wrapper mode) suggest the validation gap exists at different layers depending on the TLS integration method.

RemediationAI

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. If upgrading is temporarily blocked, route all rsync-over-TLS traffic exclusively through an independently validated VPN tunnel (e.g., WireGuard or IPsec with mutual authentication), which adds a validated encrypted channel atop the broken one - note this adds operational complexity and latency. Alternatively, restricting rsync-ssl sessions to isolated, physically controlled network segments eliminates the on-path interception prerequisite entirely, though this may require architectural changes to backup or replication pipelines. Disabling openssl/stunnel mode and falling back to unencrypted rsync is only acceptable if the data is non-sensitive and the network is fully trusted - it trades one risk for another.

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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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