Libucl: libucl: denial of service via embedded null byte in ucl input

{
  "id": "892cc5a1c16f204708504d110fe6a1a32da696b718fc090d0f7297340a26af5b",
  "url": "https://osv.dev/vulnerability/CVE-2026-0708",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Libucl: libucl: denial of service via embedded null byte in ucl input",
    "summary": "A flaw was found in libucl. A remote attacker could exploit this by providing a specially crafted Universal Configuration Language (UCL) input that contains a key with an embedded null byte. This can cause a segmentation fault (SEGV fault) in the `ucl_object_emit` function when parsing and emitting the object, leading to a Denial of Service (DoS) for the affected system.",
    "evidence": "osv:CVE-2026-0708",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-0708",
      "aliases": [
        "CVE-2026-0708"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/vstakhov/libucl",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3e7f023e184e06f30fb5792dacd9dd0f8b692f1b"
                },
                {
                  "last_affected": "3e7f023e184e06f30fb5792dacd9dd0f8b692f1b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "3e7f023e184e06f30fb5792dacd9dd0f8b692f1b"
                      },
                      {
                        "last_affected": "3e7f023e184e06f30fb5792dacd9dd0f8b692f1b"
                      }
                    ],
                    "source": "AFFECTED_FIELD_GIT",
                    "strategy": "GitCommit"
                  },
                  {
                    "cpe": "cpe:2.3:a:vstakhov:libucl:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.9.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3e7f023e184e06f30fb5792dacd9dd0f8b692f1b"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-0708.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.538703993Z",
      "provider": "osv",
      "references": [
        "https://access.redhat.com/security/cve/CVE-2026-0708",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/0xxx/CVE-2026-0708.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-0708",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2427770",
        "https://github.com/vstakhov/libucl/issues/323",
        "https://github.com/vstakhov/libucl"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "cna_assigner": "fedora",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/0xxx/CVE-2026-0708.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-0708",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487652,
  "published_at": "2026-03-17T02:28:08.429+00:00"
}