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CVE-2026-26981

CVE-2026-26981 · OpenEXR has heap-buffer-overflow via signed integer underflow in ImfContextInit.cpp

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. In versions 3.3.0 through 3.3.6 and 3.4.0 through 3.4.4, a heap-buffer-overflow (OOB read) occurs in the `istream_nonparallel_read` function in `ImfContextInit.cpp` when parsing a malformed EXR file through a memory-mapped `IStream`. A signed integer subtraction produces a negative value that is implicitly converted to `size_t`, resulting in a massive length being passed to `memcpy`. Versions 3.3.7 and 3.4.5 contain a patch.

CVSS 6.5 · Medium · EPSS 0.6% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • openexr

    Versions
    • >= 3.3.0, < 3.3.7: Affected
    • >= 3.4.0, < 3.4.5: Affected

    No fix published

  • openexr PyPI

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

    Update to 3.3.7

  • openexr PyPI

    Versions
    • 3.4.0
    • 3.4.1
    • 3.4.2
    • 3.4.3
    • 3.4.4
    Affected ranges
    • ECOSYSTEM: ≥ 3.4.0, < 3.4.5

    Update to 3.4.5

  • openexr PyPI

    Versions
    • 3.3.0
    • 3.3.1
    • 3.3.2
    • 3.3.3
    • 3.3.4
    • 3.3.5
    • 3.3.6
    • 3.4.0
    • 3.4.1
    • 3.4.2
    • 3.4.3
    • 3.4.4
    Affected ranges
    • ECOSYSTEM: ≥ 3.3.0, < 3.3.7 ∪ ≥ 3.4.0, < 3.4.5

    Update to 3.3.7; Update to 3.4.5

Original sources

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