{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "3.2.0"
              },
              {
                "fixed": "3.2.7"
              },
              {
                "introduced": "3.3.0"
              },
              {
                "fixed": "3.3.9"
              },
              {
                "introduced": "3.4.0"
              },
              {
                "fixed": "3.4.9"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "456bf42dc2fddb647c0e9ab911656e5cf757fc36"
            },
            {
              "fixed": "f6f9cee0da36e8e806f7c9186f737db487782b69"
            },
            {
              "introduced": "c7d3eac70ccde2c4ed484c6638b83ba872f71464"
            },
            {
              "fixed": "8bb3562bd7bd833bd052224c596cb4aba94afb1b"
            },
            {
              "introduced": "20a65852895894434bea88613f6d29ac8e88bd6e"
            },
            {
              "fixed": "b5fa98ac6b5fc660c0295123c1d02bbf687dbec3"
            }
          ],
          "repo": "https://github.com/academysoftwarefoundation/openexr",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-w88v-vqhq-5p24"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-704",
      "CWE-787",
      "CWE-843"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34379.json"
  },
  "details": "OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, a misaligned memory write vulnerability exists in LossyDctDecoder_execute() in src/lib/OpenEXRCore/internal_dwa_decoder.h:749. When decoding a DWA or DWAB-compressed EXR file containing a FLOAT-type channel, the decoder performs an in-place HALF→FLOAT conversion by casting an unaligned uint8_t * row pointer to float * and writing through it. Because the row buffer may not be 4-byte aligned, this constitutes undefined behavior under the C standard and crashes immediately on architectures that enforce alignment (ARM, RISC-V, etc.). On x86 it is silently tolerated at runtime but remains exploitable via compiler optimizations that assume aligned access. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.",
  "id": "CVE-2026-34379",
  "modified": "2026-07-08T05:37:52.282390575Z",
  "published": "2026-04-06T15:21:06.556Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34379.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-34379"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-w88v-vqhq-5p24"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34379.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34379"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455402"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenEXR has a misaligned write in LossyDctDecoder_execute leading to undefined behavior (DWA/DWAB decompression)"
}