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CVE-2026-101895— Angular SSR: Denial of Service (DoS) via Infinite Loop on Malformed DOCTYPE

Quick assessment

Affected
angular angular
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 8.7 · High

Affected Version Matrix 8

VendorProduct Version RangeStatus
@angular/ platform-server <= 19.2.25 affected
>= 20.0.0, < 20.3.31 affected
>= 21.0.0, < 21.2.23 affected
>= 22.0.0, < 22.1.6 affected
angular angular <= 19.2.25 affected
>= 20.0.0, < 20.3.31 affected
>= 21.0.0, < 21.2.23 affected
>= 22.0.0, < 22.1.6 affected
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I. Basic Information for CVE-2026-101895

Vulnerability Information

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Vulnerability Title
Angular SSR: Denial of Service (DoS) via Infinite Loop on Malformed DOCTYPE
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
angular angular <= 19.2.25 -
@angular/ platform-server <= 19.2.25 -

II. Public POCs for CVE-2026-101895

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III. Intelligence Information for CVE-2026-101895

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Patches & Fixes for CVE-2026-101895 (3)

Other References for CVE-2026-101895 (4)

Same Patch Batch · angular · 2026-10-14 · 3 CVEs total

CVE-2026-101896 8.2 HIGH Angular: Denial of Service via Numeric URL Matrix Parameters in Server-Side Rendering (SSR
CVE-2026-101897 5.1 MEDIUM Angular DevTools (Local DoS)

IV. Related Vulnerabilities

Same product: angular
Same vendor: angular
Same weakness: CWE-400

V. Comments for CVE-2026-101895

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