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
Affected products
openvpn: openvpn; debian: debian linux
References4
- community.openvpn.net/Security%20Announcements/CVE-2026-12996 Vendor Advisory
- community.openvpn.net/ReleaseHistory#openvpn-2621-released-1-ju… Release Notes
- community.openvpn.net/ReleaseHistory#openvpn-275-released-1-jul… Release Notes
- lists.debian.org/debian-lts-announce/2026/07/msg00013.html Mailing ListThird Party Advisory
Metrics
- CVSS 3.1
-
8.1
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H - CVSS 4.0
-
6.0
MEDIUM
Score source: CNA
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/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 - EPSS — exploit probability
- 0% percentile: 41 · as of 13 November 2026
- CWE
- CWE-125CWE-416
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.