OpenEXR Makes Use of Uninitialized Memory

{
  "id": "ec0dcec71a1353d277bac6f0425924a2c62dbdb8610cf1f0ccf1a425814abe30",
  "url": "https://osv.dev/vulnerability/CVE-2025-64181",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "OpenEXR Makes Use of Uninitialized Memory",
    "summary": "OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.3.0 through 3.3.5 and 3.4.0 through 3.4.2, while fuzzing `openexr_exrcheck_fuzzer`, Valgrind reports a conditional branch depending on uninitialized data inside `generic_unpack`. This indicates a use of uninitialized memory. The issue can result in undefined behavior and/or a potential crash/denial of service. Versions 3.3.6 and 3.4.3 fix the issue.",
    "evidence": "osv:CVE-2025-64181",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2025-64181",
      "aliases": [
        "CVE-2025-64181",
        "GHSA-3h9h-qfvw-98hq",
        "PYSEC-2026-2843"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/academysoftwarefoundation/openexr",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c7d3eac70ccde2c4ed484c6638b83ba872f71464"
                },
                {
                  "fixed": "027f33284f146d91bf983a58c8ea50c36154f339"
                },
                {
                  "introduced": "20a65852895894434bea88613f6d29ac8e88bd6e"
                },
                {
                  "fixed": "042c83d28dc8ad754f970800a651509ca61a0570"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.3.0"
                      },
                      {
                        "fixed": "3.3.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.4.0"
                      },
                      {
                        "fixed": "3.4.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.3.6-rc4",
            "v3.3.6-rc3",
            "v3.4.3-rc2",
            "v3.3.6-rc2",
            "v3.4.3-rc",
            "v3.3.6-rc",
            "v3.3.5",
            "v3.4.2-rc2",
            "v3.4.2",
            "v3.4.2-rc",
            "v3.4.1-rc2",
            "v3.4.1",
            "v3.4.1-rc",
            "v3.4.0",
            "v3.3.5-rc3",
            "v3.3.5-rc",
            "v3.3.4-rc",
            "v3.3.4",
            "v3.3.3-rc1",
            "v3.3.3",
            "v3.3.3-rc",
            "v3.3.2-rc4",
            "v3.3.2",
            "v3.3.2-rc3",
            "v3.3.2-rc2",
            "v3.3.2-rc",
            "v3.3.1-rc",
            "v3.3.1",
            "v3.3.0-rc2",
            "v3.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-64181.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.244080243Z",
      "provider": "osv",
      "references": [
        "https://github.com/user-attachments/files/23024726/archive0.zip",
        "https://github.com/user-attachments/files/23024736/archive1.zip",
        "https://github.com/user-attachments/files/23024740/archive2.zip",
        "https://github.com/user-attachments/files/23024744/archive3.zip",
        "https://github.com/user-attachments/files/23024746/archive4.zip",
        "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3h9h-qfvw-98hq",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/64xxx/CVE-2025-64181.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-64181"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-457"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/64xxx/CVE-2025-64181.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-64181",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493006,
  "published_at": "2025-11-10T21:23:04.248+00:00"
}