HDF5: H5T__conv_struct Use After Free

{
  "id": "416407f997dbab22ad9485349f67fa24f4fd967085013903cdfdff2389ba63c2",
  "url": "https://osv.dev/vulnerability/CVE-2026-34734",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HDF5: H5T__conv_struct Use After Free",
    "summary": "HDF5 is software for managing data. In 1.14.1-2 and earlier, a heap-use-after-free was found in the h5dump helper utility. An attacker who can supply a malicious h5 file can trigger a heap use-after-free. The freed object is referenced in a memmove call from H5T__conv_struct. The original object was allocated by H5D__typeinfo_init_phase3 and freed by H5D__typeinfo_term.",
    "evidence": "osv:CVE-2026-34734",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-34734",
      "aliases": [
        "CVE-2026-34734",
        "GHSA-w7v2-9cmr-pwwj"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/hdfgroup/hdf5",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "ac07382ca947de2b936204dc9d60ce9ac245a21f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.14.1-2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:hdfgroup:hdf5:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.14.1-2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "hdff5-1_14_0",
            "hdff5-1_14-_0",
            "hdf5-1_14_1",
            "1.14.1",
            "hdf5-1_13_0-rc6",
            "hdf5-1_13_0-rc5",
            "hdf5-1_13_0-rc4",
            "hdf5-1_13_0-rc3",
            "hdf5-1_13_0-rc2",
            "hdf5-1_13_0-rc1",
            "vms_last_support_trunk",
            "before_removing_mpiposix_vfd",
            "hdf5-1_9-start",
            "hdf5-1_8_0-beta5",
            "hdf5-1_8_0-beta4",
            "hdf5-1_8_0-beta3",
            "hdf5-1_8_0-beta2",
            "hdf5-1_8_0-beta1",
            "hdf5-1_8_0-alpha4",
            "hdf5-1_8_0-alpha3",
            "hdf5-1_8_0-alpha2",
            "before_removing_fphdf5",
            "before_removing_docs",
            "before_removing_tbbt_code",
            "before_signed_unsigned_changes",
            "hdf5-1_6_2",
            "hdf5-1_6_1",
            "hdf5-1_6_0",
            "hdf5-1_4_0",
            "hdf5-1_4_1",
            "hdf5-1_3_1",
            "hdf5-1_3_0",
            "hdf5-1_2_1",
            "hdf5-1_2_0beta",
            "hdf5-1_2_0-beta1-update2",
            "hdf5-1_2_0",
            "hdf5-1_0_1",
            "hdf5-1_0_0",
            "r1_1beta1",
            "hdf5-1_0_0-alpha2",
            "proto1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34734.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.086425634Z",
      "provider": "osv",
      "references": [
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34734.json",
        "https://access.redhat.com/security/cve/CVE-2026-34734",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34734.json",
        "https://github.com/HDFGroup/hdf5/security/advisories/GHSA-w7v2-9cmr-pwwj",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-34734",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2457034"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-416"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34734.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-34734",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509962,
  "published_at": "2026-04-09T19:01:21.794+00:00"
}