Integer overflow in Academysoftwarefoundation Openexr
CVE-2026-42217
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From versions 3.0.0 to before 3.2.9, 3.3.0 to before 3.3.11, and 3.4.0 to before 3.4.11, readVariableLengthInteger() decodes a variable-length integer from untrusted EXR input without bounding the shift count. After enough continuation bytes, the code executes a left shift by 70 on a 64-bit value, which is undefined behavior. This issue has been patched in versions 3.2.9, 3.3.11, and 3.4.11.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (50.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Academysoftwarefoundation Openexr — versions >= 3.0.0, < 3.2.9, >= 3.3.0, < 3.3.11, >= 3.4.0, < 3.4.11
- Openexr
Weakness classification (CWE)
References
- github.com/AcademySoftwareFoundation/openexr/commit/21eaa33bcbbb0c83a5fc42f6b6d… (Patch)
- github.com/AcademySoftwareFoundation/openexr/pull/2378 (Patch, Issue Tracking)
- github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3c67-4wwp… (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-42217?
- CVE-2026-42217 is a critical-severity vulnerability in Academysoftwarefoundation Openexr, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2026-05-07.
- How severe is CVE-2026-42217?
- Critical severity. CVSS v3 base score is 9.8 out of 10.