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OpenVPN EUVDEUVD-2026-51234

| CVE-2026-13117 MEDIUM
Use After Free (CWE-416)
2026-07-02 GHSA-6qjm-gj5v-hp7g
Information Disclosure Use After Free Memory Corruption Microsoft Openvpn
6.0
CVSS 4.0 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
6.0 MEDIUM
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/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
5.9 MEDIUM

Network-reachable but requires authenticated client (PR:L) and precise packet timing (AC:H); primary impact is server crash (A:H) with marginal UAF memory exposure (C:L), no integrity effect.

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

Primary rating from Vendor (CNA).

CVSS VectorVendor

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

5
Source Code Evidence Fetched
Jul 30, 2026 - 17:32 vuln.today
Analysis Generated
Jul 30, 2026 - 17:32 vuln.today
CVSS changed
Jul 30, 2026 - 17:22 NVD
6.0 (MEDIUM)
CVE Published
Jul 02, 2026 - 10:57 github-releases
MEDIUM 6.0
CVE Published
Jul 02, 2026 - 10:57 github-releases
UNKNOWN (no severity yet)

Description PRE-NVD

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

AnalysisAI

Use-after-free in OpenVPN's tls_wrap_reneg() function allows an authenticated remote client to crash the OpenVPN server by sending a crafted sequence of dynamic tls-crypt control-channel packets, resulting in denial of service for all connected VPN users. Affected versions prior to 2.7.5 and 2.6.21 are patched as of July 1, 2026. No public exploit code or active exploitation (CISA KEV) has been identified at time of analysis, but the vulnerability was independently discovered by multiple research teams, elevating credibility of the finding.

Technical ContextAI

CWE-416 (Use After Free) in the tls_wrap_reneg() function within OpenVPN's TLS renegotiation handling code. The vulnerability is exercisable only when the dynamic tls-crypt feature (tls-crypt-v2) is active on the server, because the trigger path involves processing dynamic tls-crypt control-channel packets. Use-after-free conditions occur when memory is freed and subsequently dereferenced; in this context, a carefully ordered sequence of control-channel packets causes a reference to freed memory within the renegotiation logic, leading to memory corruption and typically a process crash. The CVSS 4.0 vector (AV:N/AC:H/AT:N/PR:L) confirms network reachability with high complexity and low-privilege authentication. CPE-level version data is not included in the input, but the OpenVPN community release history and GitHub release v2.7.5 (also backported to 2.6.21) identify the fix boundary. Tags in the source intelligence include 'Use After Free' and 'Memory Corruption', consistent with CWE-416. The 'Microsoft' and 'Information Disclosure' tags appear to be erroneous metadata - no Microsoft component is involved, and confidentiality impact (VC:L) is marginal rather than the defining characteristic.

RemediationAI

Upgrade OpenVPN to version 2.7.5 or 2.6.21 (both released July 1, 2026), available from the official GitHub release at https://github.com/OpenVPN/openvpn/releases/tag/v2.7.5 and the OpenVPN community release page at https://community.openvpn.net/ReleaseHistory. Ubuntu users should apply the packages provided in USN-8540-1. If immediate patching is not feasible, disabling the tls-crypt-v2 (dynamic tls-crypt) feature removes the trigger path for this vulnerability - servers not using '--tls-crypt-v2' in their configuration are not exposed to this specific code path; however, disabling tls-crypt-v2 reduces control-channel authentication protection and may affect client compatibility if tls-crypt-v2 keys are deployed. Access control at the VPN gateway to restrict which clients can initiate connections provides marginal reduction in exposure but does not eliminate risk from authenticated-but-malicious clients.

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Same weakness CWE-416 – Use After Free

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 12 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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EUVD-2026-51234 vulnerability details – vuln.today
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