Bug 2401799 (CVE-2025-59733)

Summary: CVE-2025-59733 FFmpeg: FFmpeg: Buffer overflow in OpenEXR DWAA/DWAB decoding
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: gtanzill, jbuscemi
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in FFmpeg. This vulnerability allows a buffer overflow via a specially crafted OpenEXR (EXR) file using DWAA (DreamWorks Animation Adaptive) or DWAB (DreamWorks Animation B-wave) compression, due to incorrect handling of image channel pixel types during decoding.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2401827, 2401835, 2401839, 2401842, 2401861, 2417669, 2417670, 2417673, 2401862    
Bug Blocks:    

Description OSIDB Bzimport 2025-10-06 09:01:39 UTC 
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.