Vulnerability · Published Jul 25, 2025 · Assigned by Fluid Attacks

CVE-2025-8101Linkify 4.3.1 - Prototype Pollution & HTML Attribute Injection (XSS)

High 8.8

In plain English

A high-severity prototype pollution in Linkify from Linkify. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.8High

Exploit odds (30 days)0.6%top 51.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	linkifyjs	4.3.2	GHSA-95jq-xph2-cx9h

Affected products (as reported)

Vendor	Product	Versions
Linkify	Linkify	4.3.1 – before 4.3.2

Weakness: CWE-1321 · Vector: 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

References

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