{"cve":"CVE-2026-26981","nvd":{"published":"2026-02-24T03:16:01.890","modified":"2026-06-17T10:26:28.887","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-195"],"references":["https://github.com/AcademySoftwareFoundation/openexr/commit/6bb2ddf1068573d073edf81270a015b38cc05cef","https://github.com/AcademySoftwareFoundation/openexr/commit/d2be382758adc3e9ab83a3de35138ec28d93ebd8","https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-q6vj-wxvf-5m8c"],"products":["openexr:openexr"],"source":"nvd","synced_at":"2026-10-19T22:24:17.937441719+00:00"},"epss":{"cve":"CVE-2026-26981","score":0.00597,"percentile":0.48542,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-q6vj-wxvf-5m8c","url":"https://osv.dev/vulnerability/GHSA-q6vj-wxvf-5m8c","summary":"OpenEXR has heap-buffer-overflow via signed integer underflow in ImfContextInit.cpp","modified":"2026-07-13T16:43:46.630306778Z","packages":[{"ecosystem":"PyPI","name":"openexr","purl":"pkg:pypi/openexr","ranges":[">=3.3.0 <3.3.7"],"fixed":["3.3.7"]},{"ecosystem":"PyPI","name":"openexr","purl":"pkg:pypi/openexr","ranges":[">=3.4.0 <3.4.5"],"fixed":["3.4.5"]}]},{"id":"PYSEC-2026-2849","url":"https://osv.dev/vulnerability/PYSEC-2026-2849","summary":"OpenEXR has heap-buffer-overflow via signed integer underflow in ImfContextInit.cpp","modified":"2026-07-13T16:32:33.709125320Z","packages":[{"ecosystem":"PyPI","name":"openexr","purl":"pkg:pypi/openexr","ranges":[">=3.3.0 <3.3.7",">=3.4.0 <3.4.5"],"fixed":["3.3.7","3.4.5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}