Vulnerability-Lookup

CVE-2026-101895 (GCVE-0-2026-101895)

Vulnerability from cvelistv5 – Published: 2026-10-14 15:00 – Updated: 2026-10-14 17:38

Title

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

Summary

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.

Severity

8.7 (High)


                        
                          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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-14 17:37 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7640 records in the last 180 days details

References

7 references

URL	Tags
https://github.com/angular/angular/security/advis…	x_refsource_CONFIRM
https://github.com/angular/angular/commit/3db26e2…	x_refsource_MISC
https://github.com/angular/angular/commit/fc2e8fb…	x_refsource_MISC
https://github.com/angular/domino/commit/4d974731…	x_refsource_MISC
https://github.com/angular/angular/releases/tag/v…	x_refsource_MISC
https://github.com/angular/angular/releases/tag/v…	x_refsource_MISC
https://github.com/angular/angular/releases/tag/v22.1.6	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version	CPE status
angular	angular	Affected: <= 19.2.25 Affected: >= 20.0.0, < 20.3.31 Affected: >= 21.0.0, < 21.2.23 Affected: >= 22.0.0, < 22.1.6	guessed
@angular/	platform-server	Affected: <= 19.2.25 Affected: >= 20.0.0, < 20.3.31 Affected: >= 21.0.0, < 21.2.23 Affected: >= 22.0.0, < 22.1.6	guessed

Show details on NVD website

JSON

To clipboard

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                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 21.0.0, \u003c 21.2.23"
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}

FKIE_CVE-2026-101895

Vulnerability from fkie_nvd - Published: 2026-10-14 15:17 - Updated: 2026-10-14 15:17

Severity

8.7 (High) - 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

Summary

References

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

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "angular",
          "vendor": "angular",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 19.2.25"
            },
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            },
            {
              "status": "affected",
              "version": "\u003e= 21.0.0, \u003c 21.2.23"
            },
            {
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              "version": "\u003e= 22.0.0, \u003c 22.1.6"
            }
          ]
        },
        {
          "product": "platform-server",
          "vendor": "@angular/",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 19.2.25"
            },
            {
              "status": "affected",
              "version": "\u003e= 20.0.0, \u003c 20.3.31"
            },
            {
              "status": "affected",
              "version": "\u003e= 21.0.0, \u003c 21.2.23"
            },
            {
              "status": "affected",
              "version": "\u003e= 22.0.0, \u003c 22.1.6"
            }
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        }
      ],
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      "lang": "en",
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    }
  ],
  "id": "CVE-2026-101895",
  "lastModified": "2026-10-14T15:17:03.370",
  "metrics": {
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          "version": "4.0",
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    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/angular/angular/security/advisories/GHSA-f67j-2jqw-jpq7"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/angular/domino/commit/4d97473116d000e3fd4d6f75ec98cbd67576fa6f"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        },
        {
          "lang": "en",
          "value": "CWE-835"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-F67J-2JQW-JPQ7

Vulnerability from github – Published: 2026-09-28 21:31 – Updated: 2026-09-28 21:31

Summary

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

Details

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 Description

In Angular Server-Side Rendering (SSR), @angular/platform-server uses domino to parse and sanitize HTML bound through template bindings (such as [innerHTML]) or manipulated via DOM APIs.

In Domino's HTML parser (lib/HTMLParser.js), tokenizer states that specify fixed lookahead—such as after_doctype_name_state (lookahead = 6)—rely on the state handler function to explicitly advance the character index pointer (nextchar). While branches for whitespace, >, and keyword matching advance nextchar, the EOF branch (case -1: // EOF) emitted doctype and EOF tokens without advancing nextchar or transitioning out of the state:

case -1: // EOF
  forcequirks();
  emitDoctype();
  emitEOF();
  break;

Because nextchar remained unchanged pointing to the EOF marker character (\uFFFF), the scanner loop (while (nextchar < numchars)) repeatedly re-invoked after_doctype_name_state with codepoint = EOF indefinitely. In Node.js's single-threaded runtime, this synchronous loop starves the event loop entirely.

Impact & Reachability

Reachability: The vulnerability is reachable in any Angular SSR application where untrusted user input is bound to [innerHTML], interpolated into markup, or sanitized on the server.
Impact: Successful exploitation allows an unauthenticated remote attacker to cause an immediate Denial of Service (DoS) by sending a payload containing an incomplete DOCTYPE (e.g., <!DOCTYPE html). The Node.js SSR process locks up at 100% CPU and ceases responding to all concurrent and subsequent HTTP requests.

Proof of Concept:

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  standalone: true,
  template: `<div [innerHTML]="payload"></div>`,
})
export class AppComponent {
  // Attacker-controlled input containing an incomplete DOCTYPE ending with whitespace
  payload = '<!DOCTYPE html ';
}

Workarounds

Avoid binding untrusted user input directly to [innerHTML] in server-rendered templates; use standard text interpolation ({{ userInput }}) or [textContent] when raw HTML rendering is not required.
Validate or sanitize user input before passing it to [innerHTML] on the server by stripping or rejecting strings matching /^<!DOCTYPE/i.

Severity

8.7 (High)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@angular/platform-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "22.0.0"
            },
            {
              "fixed": "22.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@angular/platform-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "21.0.0"
            },
            {
              "fixed": "21.2.23"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@angular/platform-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "20.0.0"
            },
            {
              "fixed": "20.3.31"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@angular/platform-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "19.2.25"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-101895"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-835"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-28T21:31:21Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "A Denial of Service (DoS) vulnerability exists in `@angular/platform-server`\u0027s DOM emulation parser (`domino`). When processing untrusted user input containing an incomplete DOCTYPE declaration ending with whitespace before EOF (such as `\u003c!DOCTYPE html `), the HTML parser enters an infinite synchronous loop, pegging CPU utilization at 100% and completely freezing the Node.js server process.\n\n### Technical Description\nIn Angular Server-Side Rendering (SSR), `@angular/platform-server` uses `domino` to parse and sanitize HTML bound through template bindings (such as `[innerHTML]`) or manipulated via DOM APIs.\n\nIn Domino\u0027s HTML parser (`lib/HTMLParser.js`), tokenizer states that specify fixed lookahead\u2014such as `after_doctype_name_state` (`lookahead = 6`)\u2014rely on the state handler function to explicitly advance the character index pointer (`nextchar`). While branches for whitespace, `\u003e`, and keyword matching advance `nextchar`, the EOF branch (`case -1: // EOF`) emitted doctype and EOF tokens without advancing `nextchar` or transitioning out of the state:\n\n```javascript\ncase -1: // EOF\n  forcequirks();\n  emitDoctype();\n  emitEOF();\n  break;\n```\n\nBecause `nextchar` remained unchanged pointing to the EOF marker character (`\\uFFFF`), the scanner loop (`while (nextchar \u003c numchars)`) repeatedly re-invoked `after_doctype_name_state` with `codepoint = EOF` indefinitely. In Node.js\u0027s single-threaded runtime, this synchronous loop starves the event loop entirely.\n\n### Impact \u0026 Reachability\n* **Reachability**: The vulnerability is reachable in any Angular SSR application where untrusted user input is bound to `[innerHTML]`, interpolated into markup, or sanitized on the server.\n* **Impact**: Successful exploitation allows an unauthenticated remote attacker to cause an immediate Denial of Service (DoS) by sending a payload containing an incomplete DOCTYPE (e.g., `\u003c!DOCTYPE html `). The Node.js SSR process locks up at 100% CPU and ceases responding to all concurrent and subsequent HTTP requests.\n\n**Proof of Concept:**\n```ts\nimport { Component } from \u0027@angular/core\u0027;\n\n@Component({\n  selector: \u0027app-root\u0027,\n  standalone: true,\n  template: `\u003cdiv [innerHTML]=\"payload\"\u003e\u003c/div\u003e`,\n})\nexport class AppComponent {\n  // Attacker-controlled input containing an incomplete DOCTYPE ending with whitespace\n  payload = \u0027\u003c!DOCTYPE html \u0027;\n}\n```\n\n### Workarounds\n* Avoid binding untrusted user input directly to `[innerHTML]` in server-rendered templates; use standard text interpolation (`{{ userInput }}`) or `[textContent]` when raw HTML rendering is not required.\n* Validate or sanitize user input before passing it to `[innerHTML]` on the server by stripping or rejecting strings matching `/^\u003c!DOCTYPE/i`.",
  "id": "GHSA-f67j-2jqw-jpq7",
  "modified": "2026-09-28T21:31:21Z",
  "published": "2026-09-28T21:31:21Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/security/advisories/GHSA-f67j-2jqw-jpq7"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/angular/angular"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Angular SSR: Denial of Service (DoS) via Infinite Loop on Malformed DOCTYPE"
}

Sightings

Author	Source	Type	Date	Other

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Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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CVE-2026-101895 (GCVE-0-2026-101895)

FKIE_CVE-2026-101895

GHSA-F67J-2JQW-JPQ7

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