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VULNERABILITIES

CVE-2026-77206 Details

Description

Libreswan's IKEv2 state machine has a null pointer dereference bug in the EAP handling code for authentication. As a result of inconsistency within the IKEv2 state machine code, this bug can be triggered by any IKEv2 connection, even if EAP is not configured at all. The error is caused by a fall-through where it incorrectly dereferences ike->sa.st_eap which is NULL. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. The bug results in a crash and restart of the pluto daemon. No remote code execution is possible. Continued exploitation can cause a denial of service.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: Libreswan ProjectCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://libreswan.org/security/CVE-2026-77206/ Libreswan Project
https://libreswan.org/security/CVE-2026-77206/CVE-2026-77206.txt Libreswan Project

Weakness Enumeration

CWE-IDCWE NameSource
CWE-476NULL Pointer DereferenceLibreswan Project

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-77206
NVD Published Date:
Oct 13, 2026
NVD Last Modified:
Oct 16, 2026
Source:
Libreswan Project
CVE-2026-77206 Details - Not Deferred