UBUNTU-CVE-2026-34378 (CVE-2026-34378)

Vulnerability from osv_ubuntu – Published: 2026-04-06 16:16 – Updated: 2026-10-17 09:40 – Source website
VLAI
Details

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.4.0 to before 3.4.9, a missing bounds check on the dataWindow attribute in EXR file headers allows an attacker to trigger a signed integer overflow in generic_unpack(). By setting dataWindow.min.x to a large negative value, OpenEXRCore computes an enormous image width, which is later used in a signed integer multiplication that overflows, causing the process to terminate with SIGILL via UBSan. This vulnerability is fixed in 3.4.9.

Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libopenexr-3-4-33",
            "binary_version": "3.4.6+ds-4ubuntu3"
          },
          {
            "binary_name": "openexr",
            "binary_version": "3.4.6+ds-4ubuntu3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "openexr",
        "purl": "pkg:deb/ubuntu/openexr@3.4.6+ds-4ubuntu3?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1.13-2build1",
        "3.4.6+ds-4ubuntu3"
      ]
    }
  ],
  "aliases": [],
  "details": "OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.4.0 to before 3.4.9, a missing bounds check on the dataWindow attribute in EXR file headers allows an attacker to trigger a signed integer overflow in generic_unpack(). By setting dataWindow.min.x to a large negative value, OpenEXRCore computes an enormous image width, which is later used in a signed integer multiplication that overflows, causing the process to terminate with SIGILL via UBSan. This vulnerability is fixed in 3.4.9.",
  "id": "UBUNTU-CVE-2026-34378",
  "modified": "2026-10-17T09:40:52Z",
  "published": "2026-04-06T16:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-34378"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-34378"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-v76p-4qvv-vh4g"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/AcademySoftwareFoundation/openexr/pull/2321"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/AcademySoftwareFoundation/openexr/commit/088859fb6199e56824c4c9ed60afc825261bfea9"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/AcademySoftwareFoundation/openexr/commit/7a1c64ca74d12bf5f64a912d4e12a651689f8652"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-34378"
  ]
}



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