Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Immutable-Js | Immutable | < 4.3.9 |
Related Weaknesses (CWE)
References
- https://github.com/immutable-js/immutable-js/commit/a1a1ee412dcaa380ab325196283dPatch
- https://github.com/immutable-js/immutable-js/commit/f0bc997d8eb9886aff2236635aa2Patch
- https://github.com/immutable-js/immutable-js/releases/tag/v4.3.9ProductRelease Notes
- https://github.com/immutable-js/immutable-js/releases/tag/v5.1.8ProductRelease Notes
- https://github.com/immutable-js/immutable-js/security/advisories/GHSA-v56q-mh7h-ExploitMitigationVendor Advisory
- https://github.com/immutable-js/immutable-js/security/advisories/GHSA-v56q-mh7h-ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-59879?
CVE-2026-59879 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 i...
How severe is CVE-2026-59879?
CVE-2026-59879 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-59879?
Check the references section above for vendor advisories and patch information. Affected products include: Immutable-Js Immutable.