{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "1.14.6"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "7bf340440909d468dbb3cf41f0ea0d87f5050cea"
            }
          ],
          "repo": "https://github.com/hdfgroup/hdf5",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-5c6x-jmgf-f5vc"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-124"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26199.json"
  },
  "details": "HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If `H5Iget_name` is invoked on a group id with `0` for the size parameter, it will underflow when trying to place a null terminator in the buffer. This can occur if `H5Iget_name` is invoked in a way where `size` can be forced to zero, and there is important data before the `name` buffer.",
  "id": "CVE-2026-26199",
  "modified": "2026-07-22T05:29:58.597113768Z",
  "published": "2026-07-20T14:59:35.038Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26199.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26199"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Buffer underflow in `H5Iget_name `/`H5G_get_name` if size is zero"
}