JLSEC-2026-148

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internalexrundopiz advances the working wavelet pointer with signed 32-bit arithmetic. Because nx, ny, and...

OpenEXR has a signed 32-bit Overflow in PIZ Decoder Leads to OOB Read/Write

Summary internalexrundopiz advances the working wavelet pointer with signed 32-bit arithmetic: c wavbuf += nx ny wcount; Because nx, ny, and wcount are int, a crafted EXR file can make this product overflow and wrap. The next channel then decodes from an incorrect address. The wavelet decode path...

CVE-2026-34588

The connected OpenEXR/freebsd entry documents CVE-2026-34588 as a signed 32-bit overflow in the PIZ decoder causing out-of-bounds read/write. OpenEXR 3.4.9 addresses this (and related CVEs). Remediate by upgrading to OpenEXR 3.4.9; no exploitation details are provided in the available sources.

PT-2026-30662

Name of the Vulnerable Software and Affected Versions OpenEXR versions 3.1.0 through 3.2.6, versions prior to 3.3.9, and versions prior to 3.4.9 Description OpenEXR, an image storage format used in the motion picture industry, contains a flaw in the internal exr undo piz function. Specifically, t...