Angular SSR: Denial of Service (DoS) via Infinite Loop on Malformed DOCTYPE
CVSS score
8.7
EPSS probability
—
Risk score
0.9
Published
16 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
4
Source agreement
Tam uyum
Evidence confidence
%78
Short explanation
A denial of service (DoS) vulnerability exists in the Angular platform-server DOM emulation parser when processing inputs containing an incomplete DOCTYPE, leading to an infinite synchronous loop.
A remote unauthenticated attacker can exploit this condition to lock up the Node.js server process, peg CPU utilization at 100 percent, and halt subsequent requests.
What should be done?
- Update affected versions following vendor advisories
- Avoid binding untrusted user input directly to [innerHTML]
- Use standard text interpolation or [textContent]
Chain of evidence and sources
Angular platform-server DOM öykünme ayrıştırıcısı, eksik bir DOCTYPE işlendiğinde sonsuz senkron döngüye girebilir.
Saldırganlar bu durumu kullanarak Node.js SSR çalışanını tam CPU tüketimine sokabilir ve hizmet engellemeye neden olabilir.
Show the technical text from the sources
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.
CVSS 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
CWE: CWE-400, CWE-835
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-101895 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | angular | angular | View |
| 2 | angular | platform-server | View |
| 3 | npm | @angular/platform-server | View |
| 4 | npm | @angular/platform-server | View |
| 5 | npm | @angular/platform-server | View |
| 6 | npm | @angular/platform-server | View |
| 7 | npm | @angular/platform-server | View |
| 8 | npm | @angular/platform-server | View |
| 9 | npm | @angular/platform-server | View |
| 10 | npm | @angular/platform-server | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 8.7 | CVSS 4.0 | — | Vector not published | GitHub Advisory |
| 8.7 | CVSS V40 | HIGH | 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 | NVD |
| 8.7 | CVSS V4_0 | HIGH | 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 | CVE CNA |
Patch and Remediation Guide
Solution & Remediation Advisory
3 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.
22.1.6OSV düzeltilmiş sürüm: 22.1.6
21.2.23OSV düzeltilmiş sürüm: 21.2.23
20.3.31OSV düzeltilmiş sürüm: 20.3.31
Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-101895 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-101895 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
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Angular DevTools (Local DoS)
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