unarr through 1.1.1 Off-by-One Heap Buffer Overflow via tar_get_name

{
  "id": "3ffaba1115b574ef3fece1d3943d0bc7f67cac1a8dc68af245a4ed6a2081573c",
  "url": "https://osv.dev/vulnerability/CVE-2026-111273",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "unarr through 1.1.1 Off-by-One Heap Buffer Overflow via tar_get_name",
    "summary": "unarr through 1.1.1 contains an off-by-one heap-based buffer overflow in tar_get_name() in tar/parse-tar.c, reachable through the ar_entry_get_name() API. Attackers can supply a crafted TAR archive with a full ustar prefix and name to write a NUL byte past the allocation, corrupting heap memory and crashing the process.",
    "evidence": "osv:CVE-2026-111273",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-111273",
      "aliases": [
        "CVE-2026-111273"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/selmf/unarr",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "b211040df83dee513362cdeb9bd87afa26fd5e38"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.1.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.1.1"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.1.1",
            "v1.1.0",
            "v1.1.0.beta1",
            "v1.0.1",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111273.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.842174843Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111273.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-111273",
        "https://www.vulncheck.com/advisories/unarr-through-1.1.1-off-by-one-heap-buffer-overflow-via-tar-get-name",
        "https://github.com/selmf/unarr",
        "https://github.com/selmf/unarr/blob/b211040df83dee513362cdeb9bd87afa26fd5e38/tar/parse-tar.c#L242-L254",
        "https://hackmd.io/@haind-pwn/unarr-tar-zip-oob",
        "https://hackmd.io/@haind-pwn/cve-2026-111273-111274-unarr-tar-zip-oob"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-193"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111273.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-111273",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500132,
  "published_at": "2026-10-15T21:43:19.717+00:00"
}