p PatchFirst

CVE-2026-34378

CVE-2026-34378 · OpenEXR has a signed integer overflow in generic_unpack() when parsing EXR files with crafted negative dataWindow.min.x

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 6.5 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • openexr

    Versions
    • >= 3.4.0, < 3.4.9: Affected

    No fix published

  • openexr Debian:14

    Versions
    • 3.1.13-2
    • 3.4.6+ds-1
    • 3.4.6+ds-2
    • 3.4.6+ds-3
    • 3.4.6+ds-4
    Affected ranges
    • ECOSYSTEM: < 3.4.14-0.1

    Update to 3.4.14-0.1

  • openexr Ubuntu:26.10

    Versions
    • 3.1.13-2build1
    • 3.4.6+ds-4ubuntu3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

Check your server →