Integer Overflow in rxi/microtar mtar_next() Causes Infinite Loop DoS

{
  "id": "8262537b0ab64280635f04a25b85eafe813b051ba6c8cd7cecc738baf7bc3074",
  "url": "https://osv.dev/vulnerability/CVE-2026-54417",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Integer Overflow in rxi/microtar mtar_next() Causes Infinite Loop DoS",
    "summary": "An integer overflow in the mtar_next function in src/microtar.c in rxi microtar 0.1.0 allows a remote attacker to cause a denial of service (uncontrolled CPU consumption / infinite loop) via a crafted tar archive. mtar_next computes the offset to the next record as round_up(h.size, 512) + sizeof(mtar_raw_header_t) using 32-bit arithmetic.",
    "evidence": "osv:CVE-2026-54417",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-54417",
      "aliases": [
        "CVE-2026-54417"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rxi/microtar",
              "type": "GIT",
              "events": [
                {
                  "introduced": "956791770defa4d06696b30db276e88a09ad3538"
                },
                {
                  "last_affected": "956791770defa4d06696b30db276e88a09ad3538"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.1.0"
                      },
                      {
                        "last_affected": "0.1.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.1.0",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54417.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.393505789Z",
      "provider": "osv",
      "references": [
        "https://github.com/rxi/microtar/blob/master/src/microtar.c#L239",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54417.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-54417",
        "https://github.com/rxi/microtar",
        "https://raw.githubusercontent.com/rxi/microtar/master/src/microtar.c"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-190",
          "CWE-835"
        ],
        "cna_assigner": "TuranSec",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54417.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-54417",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 522210,
  "published_at": "2026-06-17T13:25:54.502+00:00"
}