CVE-2026-101895

8.7High

Published 14 Oct 2026 · NVD status: Awaiting Analysis · AI triage by gemini-3.8-flash

8.7High

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Impact: High impact on availability
Weakness: CWE-400, CWE-835

Impact

Remote unauthenticated attackers can cause a permanent denial of service by pegging Node.js SSR worker CPUs at 100% and starving the event loop. They only need to send malicious HTML payload inputs to an endpoint using server-side rendering.

Root cause

The Domino HTMLParser in @angular/platform-server fails to advance the character scanner or change state when handling an incomplete DOCTYPE ending with whitespace at EOF, causing an infinite loop.

Affected systems

Angular (@angular/platform-server) prior to 20.3.31, 21.2.23, and 22.1.6

CVSS v4.0 · 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Fix & remediation

Upgrade @angular/platform-server to version 20.3.31, 21.2.23, 22.1.6, or newer. If you cannot patch immediately, avoid parsing untrusted HTML via SSR or temporarily bypass server-side rendering for affected routes.

shell

$ npm install @angular/platform-server@latest

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD 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.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-101895