AIKIDO-2026-830125
OpenEXR is vulnerable to Information Disclosure
43
Medium Risk
This Affects:
OpenEXRTL;DR
OpenEXRCore's deep-scanline reader, embedded in the PyPI OpenEXR module, lacks the packed-size-equals-unpacked-size guard that the tiled deep path already applies for uncompressed chunks. A crafted uncompressed deep-scanline EXR with mismatched sizes leaves an unpacked buffer uninitialized and copies those bytes into the caller's pixel buffer. The fix adds the same size-equality guard to the scanline chunk reader.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you decode untrusted uncompressed deep-scanline EXR files through the OpenEXR Python bindings.
Background info
OpenEXR is vulnerable to Information Disclosure in versions 3.2.3 - 3.4.13.
How to fix this
Upgrade the OpenEXR library to the patch version.
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