OpenEXR Buffer and Overflow Issues

Integer overflow in OpenEXR ImageChannel::resize function enables heap buffer overflow through crafted EXR files processed via the OpenEXRUtil public API. Affects OpenEXR versions 3.0.0-3.2.8, 3.3.0-3.3.10, and 3.4.0-3.4.10 from the Academy Software Foundation's motion picture image format library. Vendor-released patches in versions 3.2.9, 3.3.11, and 3.4.11 add overflow validation before pixel buffer allocation. CVSS 8.8 with network vector but requires user interaction (opening malicious file). No public exploit or active exploitation identified at time of analysis.

Out-of-bounds read in OpenEXR 3.0.0-3.4.10 allows remote attackers to trigger information disclosure and denial of service by sending malformed EXR image files containing manipulated prefix-compressed strings in IDManifest structures. The vulnerability bypasses bounds checking when reconstructing strings longer than 255 bytes, reading memory outside allocated buffers. EPSS data not available; no public exploit confirmed at time of analysis. Patches released in versions 3.2.9, 3.3.11, and 3.4.11.

OpenEXR versions 3.0.0-3.2.8, 3.3.0-3.3.10, and 3.4.0-3.4.10 suffer from unbounded shift operations in the readVariableLengthInteger() function when parsing variable-length integers from untrusted EXR files. Attackers can craft malicious EXR files with excessive continuation bytes to trigger left shifts exceeding 64 bits on a 64-bit integer, causing undefined behavior that may lead to information disclosure or denial of service. The vulnerability is remotely exploitable without authentication or user interaction against any application processing untrusted EXR input; no public exploit code has been identified at the time of analysis.