# CVE-2026-12996: OpenVPN use-after-free in TLS session handling

Source: https://junglewise.ai/threats/cve-2026-12996-openvpn-use-after-free-in-tls-session-handling  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-30. Updated: 2026-07-30  
License: CC BY 4.0 with a link back

CVE-2026-12996 · Severity: info · CVSS 6 · Published 2026-07-30

OpenVPN is a widely used software for creating secure private network connections. A vulnerability has been identified where an authenticated user can send specially crafted data packets to cause the VPN service to crash or leak sensitive memory information. This could lead to a disruption of secure remote access for all users or the potential exposure of internal system data.

## Quick answers

**Is CVE-2026-12996 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-12996 being exploited in the wild.

**How severe is CVE-2026-12996?** Informational severity, with a CVSS score of 6, published 30 July 2026.

**Which products and versions are affected?** OpenVPN Inc. OpenVPN 2.6.0 through 2.6.20, 2.7_alpha1 through 2.7.4.

**Is there a fix for CVE-2026-12996?** A patch was published on 2026-07-01: OpenVPN 2.6.21 and 2.7.5 released to address the issue. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-12996 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-12996?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A use-after-free (CWE-416) and out-of-bounds read (CWE-125) vulnerability exists in OpenVPN's handling of TLS sessions. The flaw is triggered during TLS session promotion or expiry when processing crafted packets from a remote authenticated peer. An attacker with valid credentials can exploit this to cause a denial of service (application crash) or potentially leak memory contents. The vulnerability affects versions 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4. Patches are available in OpenVPN versions 2.6.21 and 2.7.5.

## Affected products

- OpenVPN Inc. OpenVPN 2.6.0 through 2.6.20, 2.7_alpha1 through 2.7.4

## Timeline

- 2026-07-01: patched: OpenVPN 2.6.21 and 2.7.5 released to address the issue.
- 2026-07-30: disclosed: CVE-2026-12996 published.

## References

- [https://community.openvpn.net/ReleaseHistory](https://community.openvpn.net/ReleaseHistory)
- [https://community.openvpn.net/ReleaseHistory](https://community.openvpn.net/ReleaseHistory)
- [https://community.openvpn.net/Security%20Announcements/CVE-2026-12996](https://community.openvpn.net/Security%20Announcements/CVE-2026-12996)