CVE-2026-59879CWE-1284CWE-190CWE-400CWE-835
Immutable.js `List` 32-bit trie overflow → unrecoverable DoS
High · published July 8, 2026
What it is
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.
The record
Technical detail
- CVSS v4.0
- 8.7 · HIGH
- Vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- EPSS
- 0.00575 · 46.8th percentile
- Weaknesses
- CWE-1284 · Improper Validation of Specified Quantity in Input; CWE-190 · Integer Overflow or Wraparound; CWE-400 · Uncontrolled Resource Consumption; CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
- Published
- 2026-07-08T15:47Z
EPSS history
Timeline