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CVE-2026-12413— IKEv2 Denial of Service via malformed fragmentation

Quick assessment

Affected
The Libreswan Project libreswan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

The Libreswan Project libreswan是The Libreswan Project组织的一个VPN安全通信软件。 The Libreswan Project libreswan 4.6版本至5.3版本存在安全漏洞，该漏洞源于在IKEv2片段重组函数reassemble_v2_incoming_fragments()中，未知外部有效载荷被存储到固定大小的数组msg_digest.digest[PAYLIMIT]中，且断言PASSERT(logger, md->digest_roof

CVSS 7.5 · High EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
The Libreswan Project libreswan 4.6≤ 5.3 affected
5.3.1 unaffected
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I. Basic Information for CVE-2026-12413

Vulnerability Information
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Vulnerability Title
IKEv2 Denial of Service via malformed fragmentation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
Off-by-one错误
Source: CVE Program / CVE List V5
Vulnerability Title
The Libreswan Project libreswan 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
The Libreswan Project libreswan是The Libreswan Project组织的一个VPN安全通信软件。 The Libreswan Project libreswan 4.6版本至5.3版本存在安全漏洞，该漏洞源于在IKEv2片段重组函数reassemble_v2_incoming_fragments()中，未知外部有效载荷被存储到固定大小的数组msg_digest.digest[PAYLIMIT]中，且断言PASSERT(logger, md->digest_roof
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
The Libreswan Project libreswan 4.6 ~ 5.3 -

II. Public POCs for CVE-2026-12413

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III. Intelligence Information for CVE-2026-12413

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Vendor Advisories for CVE-2026-12413 (2)

Same Patch Batch · The Libreswan Project · 2026-07-02 · 3 CVEs total

CVE-2026-50721 8.1 HIGH IKEv1 Denial of Service via RSA-SHA1 (PKCS#1 Version 1.5 Encrypted) authentication payload
CVE-2026-50722 8.1 HIGH IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payload

IV. Related Vulnerabilities

Same product: libreswan
Same vendor: The Libreswan Project
Same weakness: CWE-193

V. Comments for CVE-2026-12413

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