CVE-2026-59879
Immutable.js provides many Persistent Immutable data structures.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.66%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 4.0
- 8.7 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.66% probability · 50th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-190, CWE-400, CWE-835, CWE-1284
- Affected
- immutable-js/immutable
- Source
- security-advisories@github.com
References
- https://github.com/immutable-js/immutable-js/commit/a1a1ee412dcaa380ab325196283d06594ffe4b84Patch
- https://github.com/immutable-js/immutable-js/commit/f0bc997d8eb9886aff2236635aa210a95a04304aPatch
- https://github.com/immutable-js/immutable-js/releases/tag/v4.3.9Product, Release Notes
- https://github.com/immutable-js/immutable-js/releases/tag/v5.1.8Product, Release Notes
- https://github.com/immutable-js/immutable-js/security/advisories/GHSA-v56q-mh7h-f735Exploit, Mitigation, Vendor Advisory
- https://github.com/immutable-js/immutable-js/security/advisories/GHSA-v56q-mh7h-f735Exploit, Mitigation, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.