CVE-2026-26981
OpenEXR has heap-buffer-overflow via signed integer underflow in ImfContextInit.cpp
MEDIUM 6.5EPSS 0.5%
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
- AcademySoftwareFoundation · openexr
- CVSS v3.1 GITHUB
- 6.5 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - EPSS
- 0.51% chance of exploitation in the next 30 days, 42nd percentile
- Published
- 2026-02-24
Proof-of-concept exploits (1)
Security advisories
- AcademySoftwareFoundation/openexr/security/advisories/GHSA-q6vj-wxvf-5m8c
- AcademySoftwareFoundation/openexr/commit/6bb2ddf1068573d073edf81270a015b38cc05cef