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OpenVPN CVE-2026-78043

| EUVDEUVD-2026-72275 MEDIUM
Path Traversal (CWE-22)
2026-09-03 GHSA-2xjv-5x6f-xgmp
Path Traversal Red Hat Suse
5.6
CVSS 4.0 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
5.6 MEDIUM
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:N/VI:H/VA:N/SC:N/SI:H/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
5.3 MEDIUM

Local vector, low-privilege account; AC:H for the specific API-mismatch precondition; scope change because the service policy bypass impacts the broader VPN operating context beyond openvpnserv itself.

3.1 AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:N
4.0 AV:L/AC:L/AT:P/PR:L/UI:P/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
SUSE
6.6 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (CNA).

CVSS VectorVendor

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
P
Scope
X

Lifecycle Timeline

5
Metadata Corrected
Sep 07, 2026 - 08:40 vuln.today
tag: Microsoft removed
Source Code Evidence Fetched
Sep 07, 2026 - 08:27 vuln.today
Analysis Generated
Sep 07, 2026 - 08:27 vuln.today
CVE Published
Sep 03, 2026 - 18:09 github-releases
UNKNOWN (no severity yet)
CVE Published
Sep 03, 2026 - 18:09 github-releases
MEDIUM 5.6

Description PRE-NVD

Disclosed via GitHub release of openvpn/openvpn. NVD scoring and full description are pending.

AnalysisAI

Windows openvpnserv path-validation bypass in OpenVPN 2.7_alpha1 through 2.7.6 allows a low-privileged local user to circumvent administrative config-path restrictions by using '/' instead of '\' as a directory separator. Windows path-validation APIs do not recognize '/' as a separator while file-open APIs do, creating a mismatch exploitable to load a user-controlled OpenVPN config file that administrators have explicitly prohibited. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires a local Windows account with at least low privileges (PR:L) on a system running OpenVPN 2.7_alpha1 through 2.7.6 with openvpnserv active and not running exclusively in iservice mode. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:L/AC:L/AT:P/PR:L/UI:P) scores this at 5.6 (Medium), consistent with a local privilege-escalation class of finding. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade OpenVPN to version 2.7.7 or later, which explicitly rejects '/' characters in config paths within openvpnserv, eliminating the API mismatch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-22 – Path Traversal

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Same technique Path Traversal

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CVE-2019-19781 CRITICAL POC
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CVE-2021-21972 CRITICAL POC
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CVE-2021-40444 HIGH POC
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CVE-2022-41352 CRITICAL POC
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CVE-2018-20250 HIGH POC
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 12 Not-Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Not-Affected
SUSE Linux Enterprise Server 15 SP7 Not-Affected
SUSE Linux Enterprise Server 16.0 Not-Affected

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CVE-2026-78043 vulnerability details – vuln.today
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