CVE-2026-26981
Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.3.0 through 3.3.6 and 3.4.0 through 3.4.4, a heap-buffer-overflow (OOB read) occurs in the `istream_nonparallel_read` function in `ImfContextInit.cpp` when parsing a malformed EXR file through a memory-mapped `IStream`. A signed integer subtraction produces a negative value that is implicitly converted to `size_t`, resulting in a massive length being passed to `memcpy`. Versions 3.3.7 and 3.4.5 contain a patch.
How to fix
- openexr openexr3.3.7, 3.4.5 or later
- openexr3.3.7, 3.4.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| openexr openexr | 3.3.0 ≤ v < 3.3.7, 3.4.0 ≤ v < 3.4.5 | 3.3.7, 3.4.5 |
| openexrPyPI | 3.3.0 ≤ v < 3.3.7, 3.4.0 ≤ v < 3.4.5 | 3.3.7, 3.4.5 |
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