Description
The fix for CVE-2026-12996 was incomplete. A use-after-free in OpenVPN 2.6.0 through 2.6.22 and 2.7_alpha1 through 2.7.7 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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenVPN | OpenVPN | 2.6.0 – ≤ 2.6.22, 2.7_alpha1 – ≤ 2.7.7 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openvpn | 2.7.7-1 | — |
| Debian 13 | openvpn | No fix yet | — |
| Debian 12 | openvpn | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | openvpn | 2.7.0-1ubuntu1.3 | USN-8852-1 |
| Ubuntu 24.04 LTS | openvpn | 2.6.19-0ubuntu0.24.04.4 | USN-8852-1 |
| Ubuntu 22.04 LTS | openvpn | 2.5.11-0ubuntu0.22.04.5 | USN-8852-1 |
| Ubuntu 20.04 LTS | openvpn | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | openvpn | No fix yet | — |
| Ubuntu Pro 16.04 LTS | openvpn | No fix yet | — |
| Ubuntu Pro 14.04 LTS | openvpn | No fix yet | — |
Advisories 2
- USN-8852-1 openvpn vulnerabilities Ubuntu Security Notices (USN) · Oct 17, 2026
- WID-SEC-2026-3959 OpenVPN: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Oct 14, 2026