Resource exhaustion in @Angular/ Platform-Server

CVE-2026-101895

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.

Vulnerability class: DoS (Denial of Service)

Published · last modified .

EPSS exploit prediction

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Affected products

  • @Angular/ Platform-Server — versions <= 19.2.25, >= 20.0.0, < 20.3.31, >= 21.0.0, < 21.2.23
  • Angular — versions <= 19.2.25, >= 20.0.0, < 20.3.31, >= 21.0.0, < 21.2.23

Weakness classification (CWE)

References