CVE-2026-59879

Description

Immutable.js provides many Persistent Immutable data structures. Prior to 4.3.9 and 5.1.8, List#set, List#setSize, List#setIn, List#updateIn, and the functional set, setIn, and updateIn mishandle an index or size in the range 2 ** 30 to 2 ** 31 in setListBounds in src/List.js, causing an empty List to enter an uncatchable infinite loop, a populated List to allocate without bound until process abort, or setSize to silently wrap large values. This issue is fixed in versions 4.3.9 and 5.1.8.

Weakness Type (CWE)

CWE-190 Integer Overflow

CWE-400 Uncontrolled Resource Consumption

CWE-835 CWE-835

CWE-1284 CWE-1284

References

Other References

https://github.com/immutable-js/immutable-js/commit/a1a1ee412dcaa380ab325196283d06594ffe4b84 https://github.com/immutable-js/immutable-js/commit/f0bc997d8eb9886aff2236635aa210a95a04304a https://github.com/immutable-js/immutable-js/releases/tag/v4.3.9 https://github.com/immutable-js/immutable-js/releases/tag/v5.1.8 https://github.com/immutable-js/immutable-js/security/advisories/GHSA-v56q-mh7h-f735 https://github.com/immutable-js/immutable-js/security/advisories/GHSA-v56q-mh7h-f735

Frequently Asked Questions

What is CVE-2026-59879? +

Immutable.js provides many Persistent Immutable data structures. Prior to 4.3.9 and 5.1.8, List#set, List#setSize, List#setIn, List#updateIn, and the functional set, setIn, and updateIn mishandle an index or size in the range 2 ** 30 to 2 ** 31 in setListBounds in src/List.js, causing an empty List to enter an uncatchable infinite loop, a populated List to allocate without bound until process abort, or setSize to silently wrap large values. This issue is fixed in versions 4.3.9 and 5.1.8.

How do I check if I'm vulnerable to CVE-2026-59879? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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