CVE-2026-34545 — OpenEXR: integer overflow lead to OOB in HTJ2K decoder
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before ver…
Published: 2026-04-01 · CVSS: 8.4 · CVSS 4.0
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before version 3.4.7, an attacker providing a crafted .exr file with HTJ2K compression and a channel width of 32768 can write controlled data beyond the output heap buffer in any application that decodes EXR images. The write primitive is 2 bytes per overflow iteration or 4 bytes (by another path), repeating for each additional pixel past the overflow point. In this context, a heap write overflow can lead to remote code execution on systems. This issue has been patched in version 3.4.7.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7