Signed to Unsigned Conversion Error Affecting openexr package, versions [3.3.0,3.3.7)[3.4.2,3.4.5)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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 applications- Snyk IDSNYK-CONAN-OPENEXR-15338727
- published24 Feb 2026
- disclosed24 Feb 2026
- creditJungWoo Park
Introduced: 24 Feb 2026
CVE-2026-26981 (opens in a new tab)How to fix?
Upgrade openexr to version 3.3.7, 3.4.5 or higher.
Overview
Affected versions of this package are vulnerable to Signed to Unsigned Conversion Error via the istream_nonparallel_read function in ImfContextInit.cpp when parsing a malformed EXR file through a memory-mapped IStream. An attacker can cause a heap buffer overflow by supplying a specially crafted EXR file that triggers a signed integer underflow, leading to an excessive length being passed to memcpy.