EUVD-2026-19305
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Lifecycle Timeline
3Tags
Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, a misaligned memory write vulnerability exists in LossyDctDecoder_execute() in src/lib/OpenEXRCore/internal_dwa_decoder.h:749. When decoding a DWA or DWAB-compressed EXR file containing a FLOAT-type channel, the decoder performs an in-place HALF→FLOAT conversion by casting an unaligned uint8_t * row pointer to float * and writing through it. Because the row buffer may not be 4-byte aligned, this constitutes undefined behavior under the C standard and crashes immediately on architectures that enforce alignment (ARM, RISC-V, etc.). On x86 it is silently tolerated at runtime but remains exploitable via compiler optimizations that assume aligned access. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.
Analysis
Unaligned memory write in OpenEXR DWA decoder causes immediate crashes on ARM/RISC-V architectures and enables potential exploitation on x86 systems via compiler optimization abuse. Affects OpenEXR versions 3.2.0-3.2.6, 3.3.0-3.3.8, and 3.4.0-3.4.8 when processing DWA/DWAB-compressed EXR files with FLOAT-type channels. …
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Remediation
Within 24 hours: Identify all systems and applications using OpenEXR versions 3.2.0-3.2.6, 3.3.0-3.3.8, or 3.4.0-3.4.8 via software inventory and dependency scanning. Within 7 days: Implement input validation to block or sandbox DWA/DWAB-compressed EXR files from untrusted sources; disable DWA decoding if not operationally required. …
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