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CVE-2026-34588

CVE-2026-34588 · OpenEXR has a signed 32-bit Overflow in PIZ Decoder Leads to OOB Read/Write

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 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_exr_undo_piz() advances the working wavelet pointer with signed 32-bit arithmetic. Because nx, ny, and wcount are int, a crafted EXR file can make this product overflow and wrap. The next channel then decodes from an incorrect address. The wavelet decode path operates in place, so this yields both out-of-bounds reads and out-of-bounds writes. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.

CVSS 8.6 · High · EPSS 0.5% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • openexr

    Versions
    • >= 3.1.0, <= 3.1.13: Affected
    • >= 3.2.0, < 3.2.7: Affected
    • >= 3.3.0, < 3.3.9: Affected
    • >= 3.4.0, < 3.4.9: Affected

    No fix published

  • openexr Debian:12

    Versions
    • 3.1.13-1
    • 3.1.13-2
    • 3.1.5-5
    • 3.1.5-5.1
    • 3.1.5-5.1+hurd.1
    • 3.4.14-0.1
    • 3.4.15+ds-1
    • 3.4.16+ds-1
    • 3.4.6+ds-1
    • 3.4.6+ds-2
    • 3.4.6+ds-3
    • 3.4.6+ds-4
    • 3.5.2+ds-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • openexr Debian:13

    Versions
    • 3.1.13-2
    • 3.4.14-0.1
    • 3.4.15+ds-1
    • 3.4.16+ds-1
    • 3.4.6+ds-1
    • 3.4.6+ds-2
    • 3.4.6+ds-3
    • 3.4.6+ds-4
    • 3.5.2+ds-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    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 PyPI

    Versions
    • 3.2.3
    • 3.2.4
    • 3.2.5
    • 3.2.6
    Affected ranges
    • ECOSYSTEM: ≥ 3.1.0, < 3.2.7

    Update to 3.2.7

  • openexr PyPI

    Versions
    • 3.3.0
    • 3.3.1
    • 3.3.2
    • 3.3.3
    • 3.3.4
    • 3.3.5
    • 3.3.6
    • 3.3.7
    • 3.3.8
    Affected ranges
    • ECOSYSTEM: ≥ 3.3.0, < 3.3.9

    Update to 3.3.9

  • openexr PyPI

    Versions
    • 3.4.0
    • 3.4.1
    • 3.4.2
    • 3.4.3
    • 3.4.4
    • 3.4.5
    • 3.4.6
    • 3.4.7
    • 3.4.8
    Affected ranges
    • ECOSYSTEM: ≥ 3.4.0, < 3.4.9

    Update to 3.4.9

  • openexr PyPI

    Versions
    • 3.2.3
    • 3.2.4
    • 3.2.5
    • 3.2.6
    • 3.3.0
    • 3.3.1
    • 3.3.2
    • 3.3.3
    • 3.3.4
    • 3.3.5
    • 3.3.6
    • 3.3.7
    • 3.3.8
    • 3.4.0
    • 3.4.1
    • 3.4.2
    • 3.4.3
    • 3.4.4
    • 3.4.5
    • 3.4.6
    • 3.4.7
    • 3.4.8
    Affected ranges
    • ECOSYSTEM: ≥ 3.1.0, < 3.2.7 ∪ ≥ 3.3.0, < 3.3.9 ∪ ≥ 3.4.0, < 3.4.9

    Update to 3.2.7; Update to 3.3.9; Update to 3.4.9

  • openexr Ubuntu:Pro:24.04:LTS

    Versions
    • 3.1.5-5.1
    • 3.1.5-5.1build1
    • 3.1.5-5.1build2
    • 3.1.5-5.1build3
    Affected ranges
    • ECOSYSTEM: < 3.1.5-5.1ubuntu0.1~esm1

    Update to 3.1.5-5.1ubuntu0.1~esm1

  • openexr Ubuntu:25.10

    Versions
    • 3.1.13-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • openexr Ubuntu:26.10

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

    No fix published

  • openexr Ubuntu:Pro:26.04:LTS

    Versions
    • 3.1.13-2
    • 3.1.13-2build1
    Affected ranges
    • ECOSYSTEM: < 3.1.13-2ubuntu0.26.04.1~esm1

    Update to 3.1.13-2ubuntu0.26.04.1~esm1

Original sources

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