CVE-2026-101895: DoS

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.

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Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

CWE-835 CWE-835

References

Other References

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

Frequently Asked Questions

What is CVE-2026-101895? +

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.

How do I check if I'm vulnerable to CVE-2026-101895? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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