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CVE PROGRAM SOURCE RECORD8.7 High

CVE-2026-101895

Angular SSR: Denial of Service (DoS) via Infinite Loop on Malformed DOCTYPE

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Status
Published
Published
Updated
Assigning organization
GitHub_M

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

angular angular

  • <= 19.2.25affected
  • >= 20.0.0, < 20.3.31affected
  • >= 21.0.0, < 21.2.23affected
  • >= 22.0.0, < 22.1.6affected

@angular/ platform-server

  • <= 19.2.25affected
  • >= 20.0.0, < 20.3.31affected
  • >= 21.0.0, < 21.2.23affected
  • >= 22.0.0, < 22.1.6affected

References