CVE-2026-12996

EUVD-2026-51239
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
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
OpenVPNCNA
6 MEDIUM
NETWORK
HIGH
LOW
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
openvpnopenvpn
2.6.0 ≤
𝑥
≤ 2.6.20
CNA
openvpnopenvpn
𝑥
≤ 2.7.4
CNA
Debian logo
Debian Releases
Debian Product
Codename
openvpn
bookworm
2.6.14-0+deb12u2
fixed
bookworm (security)
2.6.14-0+deb12u2
fixed
bullseye
vulnerable
bullseye (security)
vulnerable
forky
2.7.5-1
fixed
sid
2.7.5-1
fixed
trixie
2.6.14-1+deb13u3
fixed
trixie (security)
2.6.14-1+deb13u3
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
openvpn
bionic
needs-triage
focal
needs-triage
jammy
Fixed 2.5.11-0ubuntu0.22.04.4
released
noble
Fixed 2.6.19-0ubuntu0.24.04.3
released
questing
ignored
resolute
Fixed 2.7.0-1ubuntu1.2
released
trusty
needs-triage
xenial
needs-triage
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
openvpn
Amazon Linux 2023
0:2.6.12-1.amzn2023.0.5
fixed
openvpn-debuginfo
Amazon Linux 2023
0:2.6.12-1.amzn2023.0.5
fixed
openvpn-debugsource
Amazon Linux 2023
0:2.6.12-1.amzn2023.0.5
fixed
openvpn-devel
Amazon Linux 2023
0:2.6.12-1.amzn2023.0.5
fixed
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://community.openvpn.net/ReleaseHistory#openvpn-2621-released-1-july-2026
https://community.openvpn.net/ReleaseHistory#openvpn-275-released-1-july-2026
https://community.openvpn.net/Security%20Announcements/CVE-2026-12996
https://lists.debian.org/debian-lts-announce/2026/07/msg00013.html