AIKIDO-2026-732202
OpenEXR is vulnerable to Denial of Service
55
Medium Risk
This Affects:
OpenEXRTL;DR
OpenEXRCore's planar HTJ2K decoder, shipped inside the PyPI OpenEXR extension module, computes a decode loop endpoint by adding an unsigned image height to a signed chunk origin. For a file with a negative data-window Y origin and vertical subsampling, mixed arithmetic wraps the endpoint so the decoder stays CPU-bound until externally terminated. The fix computes the loop endpoint entirely in signed 64-bit arithmetic.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you decode untrusted HTJ2K-compressed EXR files through the OpenEXR Python bindings.
Background info
OpenEXR is vulnerable to Denial of Service in versions 3.4.0 - 3.4.13.
How to fix this
Upgrade the OpenEXR library to the patch version.
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