CVE-2026-42216: OpenEXR: Out-of-bounds read in `IDManifest::init()` during prefix expansion
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, IDManifest::init() reconstructs strings from a prefix-compressed representation. If the previous string is longer than 255 bytes, the next string is expected to begin with a 2-byte prefix length. The code reads stringList[i][0] and stringList[i][1] without checking that the current string has at least two bytes. This issue has been patched in versions 3.2.9, 3.3.11, and 3.4.11.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-42216?
CVE-2026-42216 has been classified as a medium severity vulnerability due to the potential for out-of-bounds read exploitation.
How do I fix CVE-2026-42216?
To fix CVE-2026-42216, update OpenEXR to version 3.2.9 or later, 3.3.11 or later, or 3.4.11 or later.
What versions of OpenEXR are affected by CVE-2026-42216?
CVE-2026-42216 affects OpenEXR versions 3.0.0 to 3.2.8, 3.3.0 to 3.3.10, and 3.4.0 to 3.4.10.
What type of issue is CVE-2026-42216?
CVE-2026-42216 is categorized as an out-of-bounds read vulnerability during prefix expansion in the OpenEXR library.
Who is primarily affected by CVE-2026-42216?
Developers and organizations using vulnerable versions of OpenEXR for image storage and processing are primarily affected by CVE-2026-42216.