Integer Overflow or Wraparound Affecting immutable package, versions <4.3.9>=5.0.0-beta.1 <5.1.8
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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Test your applications- Snyk IDSNYK-JS-IMMUTABLE-17900573
- published9 Jul 2026
- disclosed8 Jul 2026
- creditMateusz Gierblinski
Introduced: 8 Jul 2026
NewCVE-2026-59879 (opens in a new tab)How to fix?
Upgrade immutable to version 4.3.9, 5.1.8 or higher.
Overview
Affected versions of this package are vulnerable to Integer Overflow or Wraparound in the setListBounds function in src/List.js when handling an index or size in the range 2 ** 30 to 2 ** 31. An attacker can cause an empty list to enter an uncatchable infinite loop, trigger unbounded memory allocation until process abort, or cause silent value wrapping by supplying crafted input values.