CVE-2026-12413

An invalidly formatted IKEv2 fragment causes the Libreswan pluto daemon to crash and restart. Continued exploitation would cause a denial of service. The function reassemble_v2_incoming_fragments() would ignore unknown outer payloads but still store these in a fixed size array msg_digest.digest[PAYLIMIT]. An off-by-one error in the assertion PASSERT(logger, md->digest_roof < elemsof(md->digest)) causes the daemon to abort. No remote code execution is possible. Any configuration that allows IKEv2 connections that do not set fragmentation=no are vulnerable. IKEv1 is not affected.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://libreswan.org/security/CVE-2026-12413/	Vendor Advisory
https://libreswan.org/security/CVE-2026-12413/CVE-2026-12413.txt	Vendor Advisory Mitigation

Configurations

Configuration 1 (hide)

cpe:2.3:a:libreswan:libreswan:*:*:*:*:*:*:*:*

History

25 Oct 2026, 21:10

Type	Values Removed	Values Added
Summary		(es) Un fragmento IKEv2 con formato no válido provoca que el demonio pluto de Libreswan se bloquee y reinicie. La explotación continuada causaría una denegación de servicio. La función reassemble_v2_incoming_fragments() ignoraría las cargas útiles externas desconocidas, pero aun así las almacenaría en un array de tamaño fijo msg_digest.digest[PAYLIMIT]. Un error off-by-one en la aserción PASSERT(logger, md -> digest_roof < elemsof(md -> digest)) provoca que el demonio aborte. No es posible la ejecución remota de código. Cualquier configuración que permita conexiones IKEv2 que no establezcan fragmentation=no es vulnerable. IKEv1 no se ve afectado.

Information

Published : 2026-07-02 22:16

Updated : 2026-10-25 21:10

NVD link : CVE-2026-12413

Mitre link : CVE-2026-12413

CVE.ORG link : CVE-2026-12413

JSON object : View

Products Affected

libreswan

libreswan

CWE

CWE-193

Off-by-one Error

CWE-617

Reachable Assertion

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