Integer Overflow or Wraparound Affecting openexr package, versions [3.2.1,3.3.9)[3.4.2,3.4.9)
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.
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- published12 Apr 2026
- disclosed6 Apr 2026
- creditpwn2woot
Introduced: 6 Apr 2026
NewCVE-2026-34378 (opens in a new tab)How to fix?
Upgrade openexr to version 3.3.9, 3.4.9 or higher.
Overview
Affected versions of this package are vulnerable to Integer Overflow or Wraparound in the generic_unpack function when parsing EXR files containing a crafted negative value for dataWindow.min.x. An attacker can cause the process to terminate unexpectedly by supplying a specially crafted EXR file that triggers a signed integer overflow during image width calculation.