CVE-2026-55373 affecting package OpenEXR 2.3.0-6

{
  "id": "c68282fad3ac6fdb47ea7f722d45c64be8fc2ccec0b366a39793227e1ae72f97",
  "url": "https://osv.dev/vulnerability/AZL-97623",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-55373 affecting package OpenEXR 2.3.0-6",
    "summary": "OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. Versions prior to 3.2.10, 3.3.12, and 3.4.13 contain an infinite-loop vulnerability in SampleCountChannel. The helper roundListSizeUp() rounds a sample-list size up to the next power of two using repeated unsigned left shifts, which terminates for normal values but fails for UINT_MAX: the sequence reaches 0x80000000, and the next left shift wraps the 32-bit value to 0. Because 0 remains less than UINT_MAX, the loop never progresses and never exits. The bug is reachable through public OpenEXRUtil APIs, either by editing the sample-count buffer through SampleCountChannel::Edit (whose destructor calls endEdit()) or by calling SampleCountChannel::set(x, y, UINT_MAX) on a valid pixel. This issue has been fixed in versions 3.2.10, 3.3.12, and 3.4.13.",
    "evidence": "osv:AZL-97623",
    "products": [
      {
        "name": {
          "value": "OpenEXR",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "AZL-97623",
      "aliases": [
        "AZL-97623"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "2.3.0-6"
                }
              ]
            }
          ],
          "package": {
            "name": "OpenEXR",
            "purl": "pkg:rpm/azure-linux/OpenEXR",
            "ecosystem": "Azure Linux:3"
          },
          "database_specific": {
            "source": "https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-97623.json"
          }
        }
      ],
      "modified": "2026-10-22T05:37:13Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-55373"
      ],
      "references": [
        "https://nvd.nist.gov/vuln/detail/CVE-2026-55373"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-55373",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 404543,
  "published_at": "2026-08-25T01:16:36+00:00"
}