Angular SSR: Denial of Service (DoS) via Infinite Loop on Malformed DOCTYPE — GHSA-F67J-2JQW-JPQ7

Summary

A Denial of Service (DoS) vulnerability exists in `@angular/platform-server`'s DOM emulation parser (`domino`). When processing untrusted user input containing an incomplete DOCTYPE declaration ending with whitespace before EOF (such as `<!DOCTYPE html `), the HTML parser enters an infinite synchronous loop, pegging CPU utilization at 100% and completely freezing the Node.js server process. ### Technical…

Timeline

Published by source

2026-09-28

Risk context

• Reported severity or threat level: high.
• Reported CVSS score: 8.7 out of 10.
• Review exposure for the affected product or family: npm: @angular/platform-server.

Product

npm: @angular/platform-server

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-F67J-2JQW-JPQ7

Source

GitHub

Vendor

GitHub

Published by source

2026-09-28

Last source activity

2026-09-28

Additional identifiers

CVE-2026-101895

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.