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
No CVSS.
References
| Link | Resource |
|---|---|
| https://b.corp.google.com/issues/436511754 |
Configurations
No configuration.
History
06 Oct 2025, 08:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-10-06 08:15
Updated : 2025-10-06 14:56
NVD link : CVE-2025-59733
Mitre link : CVE-2025-59733
CVE.ORG link : CVE-2025-59733
JSON object : View
Products Affected
No product.
CWE
CWE-787
Out-of-bounds Write