Heap-based Buffer Overflow Affecting openexr package, versions [3.3.0,3.3.6)[3.4.2,3.4.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Heap-based Buffer Overflow vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-CONAN-OPENEXR-14724772
- published30 Dec 2025
- disclosed23 Dec 2025
- creditUnknown
Introduced: 23 Dec 2025
CVE-2025-12840 (opens in a new tab)How to fix?
Upgrade openexr to version 3.3.6, 3.4.3 or higher.
Overview
Affected versions of this package are vulnerable to Heap-based Buffer Overflow in the EXR file parsing process due to improper validation of user-supplied data length before copying it to a heap-based buffer. An attacker can execute arbitrary code in the context of the current process by tricking a user into opening a malicious EXR file or visiting a malicious web page.