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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-101895

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-101895

angular

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

platform-server

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "angular",
    "product": "angular",
    "versions": [
      {
        "status": "affected",
        "version": "<= 19.2.25"
      },
      {
        "status": "affected",
        "version": ">= 20.0.0, < 20.3.31"
      },
      {
        "status": "affected",
        "version": ">= 21.0.0, < 21.2.23"
      },
      {
        "status": "affected",
        "version": ">= 22.0.0, < 22.1.6"
      }
    ]
  },
  {
    "vendor": "@angular/",
    "product": "platform-server",
    "versions": [
      {
        "status": "affected",
        "version": "<= 19.2.25"
      },
      {
        "status": "affected",
        "version": ">= 20.0.0, < 20.3.31"
      },
      {
        "status": "affected",
        "version": ">= 21.0.0, < 21.2.23"
      },
      {
        "status": "affected",
        "version": ">= 22.0.0, < 22.1.6"
      }
    ]
  }
]
Related CVEs
CVE-2026-101895

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-101895 · High

@angular/platform-server, @angular/platform-server, @angular/platform-server, @angular/platform-server

Event
#22848 · Revision 1
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