Integer Overflow or Wraparound Affecting openexr package, versions [3.4.2,3.4.10)
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.
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Start learning- Snyk IDSNYK-CONAN-OPENEXR-16191771
- published24 Apr 2026
- disclosed21 Apr 2026
- creditstanleytobias, Medoedus
Introduced: 21 Apr 2026
NewCVE-2026-39886 (opens in a new tab)How to fix?
Upgrade openexr to version 3.4.10 or higher.
Overview
Affected versions of this package are vulnerable to Integer Overflow or Wraparound in the ht_undo_impl() function due to accumulation of a bytes-per-line value (bpl) using a 32-bit signed integer without overflow protection. An attacker can cause a heap out-of-bounds write by supplying a crafted EXR file with a large number of channels and maximum width, resulting in integer overflow and subsequent memory corruption.