What’s Vulnerable › Vulnerabilities

CVE-2026-42217: OpenEXR: Shift exponent overflow in `readVariableLengthInteger()` (`ImfIDManifest.cpp`)

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-07 · updated 2026-10-26
• Weakness: CWE-190

Description

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.

Affected products

• AcademySoftwareFoundation openexr: from 3.0.0 before 3.2.9; from 3.3.0 before 3.3.11; from 3.4.0 before 3.4.11 — fixed in 3.2.9, 3.3.11, 3.4.11

How to fix

Upgrade to a fixed version: AcademySoftwareFoundation openexr 3.2.9, 3.3.11, 3.4.11. Check the vendor advisory for mitigations.

References

• https://github.com/AcademySoftwareFoundation/openexr/commit/21eaa33bcbbb0c83a5fc42f6b6d65b70a996e63c
• https://github.com/AcademySoftwareFoundation/openexr/pull/2378
• https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3c67-4wwp-w52m

Get alerted when CVE-2026-42217 or the next vulnerability affects your stack