CVE-2026-26981: OpenEXR has heap-buffer-overflow via signed integer underflow in ImfContextInit.cpp
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.
References
- github.com/AcademySoftwareFoundation/openexr
- github.com/AcademySoftwareFoundation/openexr/commit/6bb2ddf1068573d073edf81270a015b38cc05cef
- github.com/AcademySoftwareFoundation/openexr/commit/d2be382758adc3e9ab83a3de35138ec28d93ebd8
- github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-q6vj-wxvf-5m8c
- github.com/advisories/GHSA-q6vj-wxvf-5m8c
- nvd.nist.gov/vuln/detail/CVE-2026-26981
Code Behaviors & Features
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