Security advisory

{
  "id": "e0f1444e28819e7b21ec8cd91bde75db8aebf009a4fd5d85bb9d7027715828dc",
  "url": "https://osv.dev/vulnerability/CVE-2026-12413",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-12413",
    "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.",
    "evidence": "osv:CVE-2026-12413",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-12413",
      "aliases": [
        "CVE-2026-12413"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/libreswan/libreswan",
              "type": "GIT",
              "events": [
                {
                  "introduced": "5cb4ea71800792204de69a9f546ca6a41f377bf3"
                },
                {
                  "fixed": "de24519eb4ff49803a21d75e880c87834cf33beb"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:libreswan:libreswan:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.6"
                      },
                      {
                        "fixed": "5.3.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.3",
            "v5.2",
            "v5.1",
            "v5.0rc2",
            "v5.0rc1",
            "v4.9",
            "v4.8",
            "v4.7",
            "v4.6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12413.json"
          }
        }
      ],
      "modified": "2026-10-27T02:30:58.707869425Z",
      "provider": "osv",
      "references": [
        "https://libreswan.org/security/CVE-2026-12413/",
        "https://libreswan.org/security/CVE-2026-12413/CVE-2026-12413.txt"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2026-12413",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 460073,
  "published_at": "2026-07-02T22:16:42.517+00:00"
}