CVE-2026-13117
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Use-After-Free in OpenVPN Due to Incomplete Guard

Publication date: 2026-07-30

Last updated on: 2026-07-30

Assigner: OpenVPN Inc.

Description
An incomplete guard in OpenVPN 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote authenticated peers to trigger a use-after-free during TLS session promotion, potentially leading to a denial of service or memory leakage

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Meta Information

Published
2026-07-30
Last Modified
2026-07-30
Generated
2026-07-31
AI Q&A
2026-07-31
EPSS Evaluated
N/A
NVD
CVE-2026-13117
EUVD
EUVD-2026-51234

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
openvpn openvpn From 2.6.0 (inc) to 2.6.20 (inc)
openvpn openvpn From 2.7_alpha1 (inc) to 2.7.4 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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Executive Summary

This vulnerability is a use-after-free flaw in OpenVPN versions 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4. It occurs during TLS session promotion when a remote authenticated peer triggers an incomplete guard condition, potentially causing a denial of service or memory leakage.

Impact Analysis

The vulnerability may allow remote attackers to crash the OpenVPN service, leading to service disruption. It could also cause memory leakage, potentially exposing sensitive data or enabling further attacks.

Compliance Impact

This vulnerability may impact compliance with GDPR and HIPAA by potentially allowing unauthorized access to sensitive data due to memory leakage or denial of service, which could compromise data integrity and confidentiality.

Mitigation Strategies

Upgrade OpenVPN to a version later than 2.6.20 or 2.7.4 where the incomplete guard has been fixed to prevent the use-after-free issue during TLS session promotion.

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