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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-101895
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-14 15:17:03 UTC
Updated2026-10-14 18:17:10 UTC
DescriptionAngular 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.

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from [email protected]

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

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

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.7HIGHCVSS: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/C...
4.0CNADECLARED8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Angular Angular affected <= 19.2.25 Not specified
CNA Angular Angular affected >= 20.0.0, < 20.3.31 Not specified
CNA Angular Angular affected >= 21.0.0, < 21.2.23 Not specified
CNA Angular Angular affected >= 22.0.0, < 22.1.6 Not specified
CNA @angular Platform-server affected <= 19.2.25 Not specified
CNA @angular Platform-server affected >= 20.0.0, < 20.3.31 Not specified
CNA @angular Platform-server affected >= 21.0.0, < 21.2.23 Not specified
CNA @angular Platform-server affected >= 22.0.0, < 22.1.6 Not specified

References

ReferenceSourceLinkTags
github.com/angular/angular/commit/3db26e2544964d07a520836ad01f02f36ec88e25 [email protected] github.com
github.com/angular/angular/commit/fc2e8fbc0bda2f5c11585e8a0cbd88c074f5e567 [email protected] github.com
github.com/angular/angular/releases/tag/v22.1.6 [email protected] github.com
github.com/angular/angular/releases/tag/v21.2.23 [email protected] github.com
github.com/angular/angular/security/advisories/GHSA-f67j-2jqw-jpq7 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/angular/domino/commit/4d97473116d000e3fd4d6f75ec98cbd67576fa6f [email protected] github.com
github.com/angular/angular/releases/tag/v20.3.31 [email protected] github.com
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