CVE-2026-27622

The record

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In CompositeDeepScanLine::readPixels, per-pixel totals are accumulated in vector<unsigned int> total_sizes for attacker-controlled large counts across many parts, total_sizes[ptr] wraps modulo 2^32. overall_sample_count is then derived from wrapped totals and used in samples[channel].resize(overall_sample_count). Decode pointer setup/consumption proceeds with true sample counts, and write operations in core unpack (generic_unpack_deep_pointers) overrun the undersized composite sample buffer. This vulnerability is fixed in v3.2.6, v3.3.8, and v3.4.6.

Affected packages

Related vulnerabilities

• GHSA-cr4v-6jm6-4963 OpenEXR's CompositeDeepScanLine integer-overflow leads to heap OOB write Same vulnerability
• CVE-2017-9111 In OpenEXR 2.2.0, an invalid write of size 8 in the storeSSE function in… Also affects openexr
• CVE-2026-34589 OpenEXR provides the specification and reference implementation of the EXR file format… Also affects openexr
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• CVE-2026-34379 OpenEXR provides the specification and reference implementation of the EXR file format… Also affects openexr
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• CVE-2025-12495 Academy Software Foundation OpenEXR EXR File Parsing Heap-based Buffer Overflow Remote… Also affects openexr
• CVE-2025-12840 Academy Software Foundation OpenEXR EXR File Parsing Heap-based Buffer Overflow Remote… Also affects openexr