Vulnerability in Academysoftwarefoundation Openexr
CVE-2026-26981
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.
EPSS: 0.005 (42.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
Affected products
- Academysoftwarefoundation Openexr — versions >= 3.3.0, < 3.3.7, >= 3.4.0, < 3.4.5
- Openexr
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-26981?
- CVE-2026-26981 is a medium-severity vulnerability in Academysoftwarefoundation Openexr, classified under CWE-195. CVSS score: 6.5/10. Published 2026-02-24.
- How severe is CVE-2026-26981?
- Medium severity. CVSS v3 base score is 6.5 out of 10.