AIKIDO-2026-866843
pillow-heif is vulnerable to Out-of-bounds Read
44
Medium Risk
This Affects:
pillow-heifTL;DR
The C encoder in _pillow_heif.c checks a plane buffer against stride_in * height, but _CtxWriteImage_add_plane copies real_stride bytes per row. When encode() is called with a stride smaller than the actual row width, the copy reads past the end of the buffer, crashing the process and copying adjacent heap memory into the output image. The fix rejects non-positive dimensions and any stride_in smaller than real_stride before copying.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you pass raw plane data with a caller controlled stride to the encoder.
Background info
pillow-heif is vulnerable to Out-of-bounds Read in versions 0.0.1 - 1.6.0.
How to fix this
Upgrade the pillow-heif library to the patch version.
Are You Affected?
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SOC 2Compliant
ISO 27001CompliantISO 42001Compliant
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