CVE-2026-12996 Debian — Exploit & Vulnerability Details MEDIUM

Parameter	Value
CVSS	6.0 (MEDIUM)
Affected Versions	2.6.0 — 2.7.5
Fixed In	2.6.21
Type	CWE-125 (Out-of-bounds Read), CWE-416 (Use After Free)
Vendor	Debian
Public PoC	No

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

Attack Parameters

Attack Vector

Network

Can be exploited remotely

Attack Complexity

High

Difficult to exploit

Attack Requirements

Present

Additional conditions required

Privileges Required

Low

Basic privileges needed

User Interaction

None

No user interaction needed

Impact Assessment

Confidentiality

Low

Partial data leak

Integrity

None

No data modification

Availability

High

Complete denial of service

CVSS Vector v4.0

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

CWE-416 Use After Free

Vulnerable Products 3

Configuration	From (including)	Up to (excluding)
Openvpn Openvpn cpe:2.3:a:openvpn:openvpn::::::::	`2.6.0`	`2.6.21`
Openvpn Openvpn cpe:2.3:a:openvpn:openvpn::::::::	`2.7`	`2.7.5`
Debian Debian_Linux cpe:2.3:o:debian:debian_linux:11.0:::::::*	—	—