FKIE_CVE-2026-12413

Vulnerability from fkie_nvd - Published: 2026-07-02 22:16 - Updated: 2026-07-02 22:16
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
d42dc95b-23f1-4e06-9076-20753a0fb0dfhttps://libreswan.org/security/CVE-2026-12413/
d42dc95b-23f1-4e06-9076-20753a0fb0dfhttps://libreswan.org/security/CVE-2026-12413/CVE-2026-12413.txt
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "libreswan",
          "vendor": "The Libreswan Project",
          "versions": [
            {
              "lessThanOrEqual": "5.3",
              "status": "affected",
              "version": "4.6",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.3.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "d42dc95b-23f1-4e06-9076-20753a0fb0df"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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-\u003edigest_roof \u003c elemsof(md-\u003edigest)) 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."
    }
  ],
  "id": "CVE-2026-12413",
  "lastModified": "2026-07-02T22:16:42.517",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-02T22:16:42.517",
  "references": [
    {
      "source": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
      "url": "https://libreswan.org/security/CVE-2026-12413/"
    },
    {
      "source": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
      "url": "https://libreswan.org/security/CVE-2026-12413/CVE-2026-12413.txt"
    }
  ],
  "sourceIdentifier": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-193"
        },
        {
          "lang": "en",
          "value": "CWE-617"
        }
      ],
      "source": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
      "type": "Secondary"
    }
  ]
}


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