medium6.5
CVE-2026-26981
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | OpenEXR | >= 3.3.0, < 3.3.7 | 3.3.7 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Openexr | Openexr | from 3.3.0 before 3.3.7 from 3.4.0 before 3.4.5 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-q6vj-wxvf-5m8c
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-q6vj-wxvf-5m8c
- https://nvd.nist.gov/vuln/detail/CVE-2026-26981
- https://github.com/AcademySoftwareFoundation/openexr/commit/6bb2ddf1068573d073edf81270a015b38cc05cef
- https://github.com/AcademySoftwareFoundation/openexr/commit/d2be382758adc3e9ab83a3de35138ec28d93ebd8