Vulnerability · Published Oct 14, 2026 · Assigned by GitHub_M
CVE-2026-101895Angular SSR: Denial of Service (DoS) via Infinite Loop on Malformed DOCTYPE
High 8.7
In plain English
A high-severity uncontrolled resource consumption in angular from angular. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | angular.js | no fix listed | DEBIAN-CVE-2026-101895 |
| Debian:13 | angular.js | no fix listed | DEBIAN-CVE-2026-101895 |
| npm | @angular/platform-server | 22.1.6 | GHSA-f67j-2jqw-jpq7 |
| npm | @angular/platform-server | 21.2.23 | GHSA-f67j-2jqw-jpq7 |
| npm | @angular/platform-server | 20.3.31 | GHSA-f67j-2jqw-jpq7 |
| npm | @angular/platform-server | no fix listed | GHSA-f67j-2jqw-jpq7 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| angular | angular | <= 19.2.25>= 20.0.0, < 20.3.31>= 21.0.0, < 21.2.23>= 22.0.0, < 22.1.6 |
| @angular/ | platform-server | <= 19.2.25>= 20.0.0, < 20.3.31>= 21.0.0, < 21.2.23>= 22.0.0, < 22.1.6 |
Weakness: CWE-400, CWE-835 · 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
References
- https://github.com/angular/angular/security/advisories/GHSA-f67j-2jqw-jpq7 x_refsource_CONFIRM
- https://github.com/angular/angular/commit/3db26e2544964d07a520836ad01f02f36ec88e25 x_refsource_MISC
- https://github.com/angular/angular/commit/fc2e8fbc0bda2f5c11585e8a0cbd88c074f5e567 x_refsource_MISC
- https://github.com/angular/domino/commit/4d97473116d000e3fd4d6f75ec98cbd67576fa6f x_refsource_MISC
- https://github.com/angular/angular/releases/tag/v20.3.31 x_refsource_MISC
- https://github.com/angular/angular/releases/tag/v21.2.23 x_refsource_MISC
- https://github.com/angular/angular/releases/tag/v22.1.6 x_refsource_MISC