Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, a signed integer overflow exists in undo_pxr24_impl() in src/lib/OpenEXRCore/internal_pxr24.c at line 377. The expression (uint64_t)(w * 3) computes w * 3 as a signed 32-bit integer before casting to uint64_t. When w is large, this multiplication constitutes undefined behavior under the C standard. On tested builds (clang/gcc without sanitizers), two's-complement wraparound commonly occurs, and for specific values of w the wrapped result is a small positive integer, which may allow the subsequent bounds check to pass incorrectly. If the check is bypassed, the decoding loop proceeds to write pixel data through dout, potentially extending far beyond the allocated output buffer. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.
INFO
Published Date :
2026-04-06T15:22:40.198Z
Last Modified :
2026-04-07T14:15:07.727Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-34380 vulnerability.
| Vendors | Products |
|---|---|
| Academysoftwarefoundation |
|
| Openexr |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-34380.
