| Name | CVE-2026-12996 |
| Description | A use-after-free in OpenVPN 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote authenticated peers to potentially cause a denial of service or leak memory via crafted packets during TLS session promotion or expiry |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-4666-1, DSA-6376-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| openvpn (PTS) | bullseye | 2.5.1-3 | vulnerable |
| bullseye (security) | 2.5.1-3+deb11u4 | fixed |
| bookworm, bookworm (security) | 2.6.14-0+deb12u2 | fixed |
| trixie (security), trixie | 2.6.14-1+deb13u3 | fixed |
| forky, sid | 2.7.5-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
Fixed by: https://github.com/OpenVPN/openvpn/commit/5ee1f9b90fe03ecf7cef5431147ecaabbe96db9e (v2.7.5)
The issue is caused by the patch for CVE-2026-40215. Bullseye's version contains the fix for both.