Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-40215

Severity CVSS v4.0:
MEDIUM
Type:
CWE-125 Out-of-bounds Read
Publication date:
08/06/2026
Last modified:
08/06/2026

Description

A race condition in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows remote attackers to potentially cause a server crash or leak heap memory via a use-after-free triggered during TLS session promotion.

Impact

Vector 4.0
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:L/SI:N/SA:L CVSS v4.0 Severity and Metrics:

Base Score: 6.10 MEDIUM
Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:L/SI:N/SA:L

Attack Vector (AV): Network
Attack Complexity (AC): High
Attack Requirements (AT): None
Privileges Required (PR): Low
User Interaction (UI): None
Confidentiality (VC): High
Integrity (VI): None
Availability (VA): High
Confidentiality (SC): Low
Integrity (SI): None
Availability (SA): Low

Base Score 4.0
6.10
Severity 4.0
MEDIUM

References to Advisories, Solutions, and Tools