Immutabl: Hash-collision algorithmic complexity denial of service in Immutable.Map/Set
- Severity:
- High
Description
Immutable.Map and Immutable.Set keep keys that share the same 32-bit hash in a collision bucket that is scanned linearly.
Recommendation
Update the immutable package to the latest compatible version. Followings are version details:
Affected version(s): **>= 5.0.0-beta.1, < 5.1.8 < 4.3.9** Patched version(s): **5.1.8 4.3.9**
References
Related Issues
- Immutable: Hash-collision algorithmic complexity denial of service in Immutable.Map/Set - CVE-2026-59880
- protobuf.js: Process-wide denial of service through unsafe option paths - CVE-2026-44290
- path-to-regexp vulnerable to Regular Expression Denial of Service via multiple route parameters - CVE-2026-4867
- Handlebars.js has Denial of Service via Malformed Decorator Syntax in Template Compilation - CVE-2026-33939
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- Tags:
- npm
- immutable
Anything's wrong? Let us know Last updated on July 21, 2026