CVE-2025-59733

CVE-2025-59733 · Heap-buffer-overflow write in FFmpeg EXR dwa_uncompress

This page contains facts from public vulnerability sources. Check the original advisory before updating.

When decoding an OpenEXR file that uses DWAA or DWAB compression, there's an implicit assumption that all image channels have the same pixel type (and size), and that if there are four channels, the first four are "B", "G", "R" and "A". The channel parsing code can be found in decode_header. The buffer td->uncompressed_data is allocated in decode_block based on the xsize, ysize and computed current_channel_offset. The function dwa_uncompress then assumes at [5] that if there are 4 channels, these are "B", "G", "R" and "A", and in the calculations at [6] and [7] that all channels are of the same type, which matches the type of the main color channels. If we set the main color channels to a 4-byte type and add duplicate or unknown channels of the 2-byte EXR_HALF type, then the addition at [7] will increment the pointer by 4-bytes * xsize * nb_channels, which will exceed the allocated buffer. We recommend upgrading to version 8.0 or beyond.

CVSS 8.7 · High · EPSS 0.2% · Fix available

Published

2025-10-06T08:09:37.290Z

Updated

2026-02-26T17:48:17.036Z

Stack: system

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