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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.
Cite this page
CVE-2026-34545. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-34545
Use CWE-122, Openexr vendor hub and Openexr product page to widen CVE-2026-34545 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2026-34543, CVE-2026-34588 and CVE-2026-40250 for nearby disclosures in the same product family.