CVE-2025-8101

Linkify 4.3.1 - Prototype Pollution & HTML Attribute Injection (XSS)

State: Published
Severity: 8.8 High
Published: Jul 25, 2025
Updated: Dec 3, 2025
Reserved: Jul 23, 2025

Description

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability in Linkify (linkifyjs) allows XSS Targeting HTML Attributes and Manipulating User-Controlled Variables.This issue affects Linkify: from 4.3.1 before 4.3.2.

Scores

CVSS	Score	Vector	Source
4.0	8.8 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N	Fluid Attacks

Weaknesses

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Affected Products

Product	Versions
LinkifyLinkify	4.3.1 to before 4.3.2Affected

References

https://fluidattacks.com/advisories/charlythird-party-advisory
https://github.com/nfrasser/linkifyjsproduct
https://www.npmjs.com/package/linkifyjsproduct
https://github.com/nfrasser/linkifyjs/releases/tag/v4.3.2patch

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