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
Could your website be exposed too?
SmartScanner can check your website for Immutable: Hash-collision algorithmic complexity denial of service in Immutable.Map/Set and gives you actionable findings to investigate.
Start a free scanRelated Issues
- Immutabl: Hash-collision algorithmic complexity denial of service in Immutable.Map/Set - CVE-2026-59880
- protobufjs: Denial of Service via unbounded recursive JSON descriptor expansion - CVE-2026-45740
- 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
You might also like:
See something that needs correcting? Let us knowUpdated August 14, 2026