What is CVE-2026-12996?

CVE-2026-12996 is a high-severity vulnerability in Openvpn, classified under Out-of-bounds Read. CVSS score: 8.1/10. Published 2026-07-30.

How severe is CVE-2026-12996?

High severity. CVSS v3 base score is 8.1 out of 10.

Out-of-bounds Read in Openvpn

CVE-2026-12996

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

Vulnerability class: Buffer Overflow

EPSS: 0.005 (38.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

Affected products

Openvpn — versions 2.6.0, 2.7_alpha1
Debian Debian_linux — versions 11.0

Weakness classification (CWE)

References

security@openvpn.net (vendor-advisory, Vendor Advisory)
security@openvpn.net (release-notes, Release Notes)
security@openvpn.net (release-notes, Release Notes)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-12996?: CVE-2026-12996 is a high-severity vulnerability in Openvpn, classified under Out-of-bounds Read. CVSS score: 8.1/10. Published 2026-07-30.
How severe is CVE-2026-12996?: High severity. CVSS v3 base score is 8.1 out of 10.