Heap corruption via DWA width multiplication overflow
Published Apr 21, 2026 · Updated Apr 21, 2026
Integer overflow in OpenEXR 3.2.0 through 3.2.7, 3.3.0 through 3.3.9, and 3.4.0 through 3.4.9 allows attackers to corrupt heap via crafted files. DwaCompressor_uncompress multiplies an untrusted 32-bit dataWindow width by the channel element size in signed 32-bit arithmetic, then advances outBufferEnd by the wrapped negative result so decoded row pointers alias earlier heap regions. Opening a crafted DWAA or DWAB file with a FLOAT channel wider than 536,870,912 pixels triggers the corruption; no code-execution outcome has been demonstrated.
Summary
What happened
Integer overflow in OpenEXR 3.2.0 through 3.2.7, 3.3.0 through 3.3.9, and 3.4.0 through 3.4.9 allows attackers to corrupt heap via crafted files. DwaCompressor_uncompress multiplies an untrusted 32-bit dataWindow width by the channel element size in signed 32-bit arithmetic, then advances outBufferEnd by the wrapped negative result so decoded row pointers alias earlier heap regions. Opening a crafted DWAA or DWAB file with a FLOAT channel wider than 536,870,912 pixels triggers the corruption; no code-execution outcome has been demonstrated.
The record
- CVE
- CVE-2026-40250
- Published
- Apr 21, 2026
- Updated
- Apr 21, 2026
- Vendor
- Academy Software Foundation
- Product
- OpenEXR
- Classifications
- CWE-190, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 21, 2026CVE publishedPublication date reported by the CVE source.
- Apr 21, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 3.2.0, < 3.2.8
- Affected versionversion=>= 3.3.0, < 3.3.10
- Affected versionversion=>= 3.4.0, < 3.4.10
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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