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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 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_exr_undo_piz() advances the working wavelet pointer with signed 32-bit arithmetic. 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 operates in place, so this yields both out-of-bounds reads and out-of-bounds writes. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.
Cite this page
CVE-2026-34588. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-34588
Use CWE-125, Openexr vendor hub and Openexr product page to widen CVE-2026-34588 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2026-34543, CVE-2026-40250 and CVE-2026-40244 for nearby disclosures in the same product family.