CVE-2026-59879
Published:July 08, 2026
Updated:August 04, 2026
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.
Affected Packages
immutable (CDN_JS):
Affected version(s) >=2.0.0 <4.3.9Fix Suggestion:
Update to version 4.3.9immutable (CDN_JS):
Affected version(s) >=2.0.0 <4.3.9Fix Suggestion:
Update to version 4.3.9immutable (CDN_JS):
Affected version(s) >=5.0.0-beta.1 <5.1.8Fix Suggestion:
Update to version 5.1.8immutable (CDN_JS):
Affected version(s) >=5.0.0 <5.1.8Fix Suggestion:
Update to version 5.1.8https://github.com/immutable-js/immutable-js.git (GITHUB):
Affected version(s) >=v3.8.0 <4.3.9Fix Suggestion:
Update to version 4.3.9immutable (NPM):
Affected version(s) >=0.8.0-SNAPSHOT <4.3.9Fix Suggestion:
Update to version 4.3.9immutable (NPM):
Affected version(s) >=5.0.0-beta.1 <5.1.8Fix Suggestion:
Update to version 5.1.8immutable (NPM):
Affected version(s) >=5.0.0 <5.1.8Fix Suggestion:
Update to version 5.1.8immutable (NPM):
Affected version(s) >=0.8.0-SNAPSHOT <4.3.9Fix Suggestion:
Update to version 4.3.9Related Resources (8)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.44