Heap out-of-bounds write via HTJ2K integer overflow
Published Jun 18, 2026 · Updated Jun 18, 2026
Integer overflow in OpenEXR 3.4.0 through 3.4.11 allows context-dependent attackers to trigger a heap out-of-bounds write via a crafted EXR file. In ht_undo_impl(), 32-bit signed multiplication of each decoded channel width by bytes_per_element wraps for large widths, corrupting offsets later used in pointer arithmetic. Exploitation requires an application to decode attacker-controlled HTJ2K content; the resulting write can corrupt image data and interrupt the process.
Summary
What happened
Integer overflow in OpenEXR 3.4.0 through 3.4.11 allows context-dependent attackers to trigger a heap out-of-bounds write via a crafted EXR file. In ht_undo_impl(), 32-bit signed multiplication of each decoded channel width by bytes_per_element wraps for large widths, corrupting offsets later used in pointer arithmetic. Exploitation requires an application to decode attacker-controlled HTJ2K content; the resulting write can corrupt image data and interrupt the process.
The record
- CVE
- CVE-2026-44663
- Published
- Jun 18, 2026
- Updated
- Jun 18, 2026
- Vendor
- Academy Software Foundation
- Product
- OpenEXR
- Classifications
- CWE-190, CWE-787, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 18, 2026CVE publishedPublication date reported by the CVE source.
- Jun 18, 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=>= 3.4.0, < 3.4.11
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
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- OpenEXR HTJ2K ASAN reproduction harnessproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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