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Vulnerability record · CVE-2026-12996 · published 30 July 2026

CVE-2026-12996: Openvpn out-of-bounds read vulnerability

Openvpn · Openvpn

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

6.0 CVSS 4.0 Medium EPSS 0.81% · top 44.7% CWE-125 · Out-of-bounds readCWE-416 · Use after free
6.0CVSS 4.0 base score
0.81%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
5 Aug 2026Last modified by NVD

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

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:

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://community.openvpn.net/ReleaseHistory#openvpn-2621-released-1-july-2026 Release Notes
https://community.openvpn.net/ReleaseHistory#openvpn-275-released-1-july-2026 Release Notes
https://community.openvpn.net/Security%20Announcements/CVE-2026-12996 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2026/07/msg00013.html Mailing ListThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-12996), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.