How severe is CVE-2025-8101?

No CVSS score has been assigned to CVE-2025-8101 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2025-8101?

CVE-2025-8101 affects the following packages: linkifyjs (npm). Ecosystems affected: npm.

How do I fix CVE-2025-8101?

Update linkifyjs to 4.3.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-8101 is resolved across your whole dependency graph.

How do I detect CVE-2025-8101 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for linkifyjs, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2025-8101 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2025-8101 actively exploited in the wild?

No public exploit code has been indexed for CVE-2025-8101 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2025-8101?

CVE-2025-8101 has an EPSS (Exploit Prediction Scoring System) score of 0.6%, placing it in the 49th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2025-8101?

CVE-2025-8101 is classified as CWE-1321 (CWE-1321). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2025-8101 published, and has it been updated?

CVE-2025-8101 was published on July 25, 2025 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

CVE-2025-8101 — linkifyjs

Fix: nfrasser/linkifyjs@931d3e2

CVE-2025-8101 is a CWE-1321 vulnerability in linkifyjs. A fix is available for linkifyjs — see the affected versions and patch details below.

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

Also known asGHSA-95jq-xph2-cx9h

Published

Jul 25, 2025

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-8101.

EPSS Exploitation Probability

via FIRST.org ↗

0.6%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs49th percentile — riskier than 49% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

467other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

linkifyjsnpm

33.6Mdownloads / week

Description

Prototype Pollution in internal assign() helper in Linkify allows remote attackers to execute arbitrary JavaScript (Stored or Reflected XSS) via injection of event handlers through unfiltered proto property. This issue affects Linkify version 4.3.1 and is fixed in 4.3.2.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`linkifyjs`	≥ 4.3.1&&< 4.3.2	4.3.2`npm install linkifyjs@4.3.2`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for linkifyjs, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update linkifyjs to 4.3.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-8101 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

No Red Hat products or offerings are affected by this vulnerability. This vulnerability is Important rather than Moderate because it enables a direct escalation from a logic flaw (prototype pollution) to active client-side code execution (XSS) in a single step, with no complex exploitation required. By failing to…

Workaround published by Red Hat

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Source: Red Hat security advisory for CVE-2025-8101 (CC BY 4.0)

Frequently Asked Questions

Prototype Pollution in internal `assign()` helper in Linkify allows remote attackers to execute arbitrary JavaScript (Stored or Reflected XSS) via injection of event handlers through unfiltered proto property. This issue affects Linkify version 4.3.1 and is fixed in 4.3.2.

O3 Security · Impact-Aware SCA

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