{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.1.0"
              },
              {
                "last_affected": "0.1.0"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "956791770defa4d06696b30db276e88a09ad3538"
            },
            {
              "last_affected": "956791770defa4d06696b30db276e88a09ad3538"
            }
          ],
          "repo": "https://github.com/rxi/microtar",
          "type": "GIT"
        }
      ],
      "versions": [
        "0.1.0"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "TuranSec",
    "cwe_ids": [
      "CWE-121",
      "CWE-170"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55738.json"
  },
  "details": "A stack-based buffer overflow exists in the raw_to_header() function in src/microtar.c in rxi microtar 0.1.0. The function copies the 100-byte name and linkname fields of a TAR header with strcpy() without guaranteeing null termination of the source. The POSIX ustar format permits these fixed-width fields to be fully populated with non-null bytes, so a crafted archive whose linkname field (followed by the trailing padding of the 512-byte raw header) contains no null terminator causes strcpy() to read past the end of the 512-byte raw header stack buffer and to write past the destination header buffer. A remote attacker who supplies a crafted TAR archive that the victim opens or parses (via mtar_open(), mtar_read_header(), or mtar_find()) can cause an out-of-bounds read and a stack buffer overflow, resulting in denial of service (crash) and potentially arbitrary code execution. Confirmed with AddressSanitizer: stack-buffer-overflow READ of size 356 in raw_to_header at src/microtar.c:112.",
  "id": "CVE-2026-55738",
  "modified": "2026-07-08T05:39:31.753178286Z",
  "published": "2026-06-17T13:45:00.399Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rxi/microtar/blob/master/src/microtar.c#L111"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55738.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55738"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rxi/microtar"
    },
    {
      "type": "ARTICLE",
      "url": "https://raw.githubusercontent.com/rxi/microtar/master/src/microtar.c"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Stack Buffer Overflow in rxi/microtar raw_to_header() via non-null-terminated TAR name field"
}