AUGUST 24, 2026
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Case File

CVE-2026-59879

HIGH · CVSS 7.5 EPSS 0.44% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-08 · Last synced 2026-08-07

CyberRota Analysis

AI-Generated

Immutable.js versions prior to 4.3.9 and 5.1.8 are vulnerable to a flaw in the List data structure methods that can lead to an infinite loop or uncontrolled memory allocation when handling large index or size values. This could result in application crashes or degraded performance, making it critical for developers using these versions to upgrade immediately. Organizations relying on Immutable.js for data management should prioritize this update to mitigate potential denial-of-service risks.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-59879
Severity
HIGH
CVSS
7.5
EPSS
0.44%

Original NVD 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.

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