CVE-2026-101895· CVE.org (no NVD analysis yet)· CNA GitHub_M

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

Noroxi assessment

Priority: Monitor (action score 34/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.71% (FIRST EPSS); higher than 53.2% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: @angular/platform-server (npm) 20.3.31, 21.2.23, 22.1.6.

Low priority for now. Upgrade to @angular/platform-server (npm) 20.3.31, 21.2.23, 22.1.6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.7 · v4.0—No exploit Fix available

Published: Oct 14, 2026
Updated: Oct 16, 2026
EPSS: 0.7% · 53th percentile
CWE: CWE-400

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 34 / 40 · 8.7 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.7%

CISA SSVC decision

Exploitation: proof of concept
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · GitHub_M: 8.7; NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

@angular/ platform-server
- <= 19.2.25, >= 20.0.0, < 20.3.31, >= 21.0.0, < 21.2.23, >= 22.0.0, < 22.1.6affected
angular angular
- <= 19.2.25, >= 20.0.0, < 20.3.31, >= 21.0.0, < 21.2.23, >= 22.0.0, < 22.1.6affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	angular.js	from 0	—
npm	@angular/platform-server	from 20.0.0 · before 20.3.31	20.3.31
npm	@angular/platform-server	from 21.0.0 · before 21.2.23	21.2.23
npm	@angular/platform-server	from 22.0.0 · before 22.1.6	22.1.6
npm	@angular/platform-server	up to and including 19.2.25	—

Same product

angular: all records

Other highest-scoring records for the same primary product.

CVE-2026-68945Angular: Cache-Key Ambiguity in HttpTransferCache Leading to Cross-Request Response Reuse and State Poisoning
35Monitor
CVE-2026-50168Angular: URL Parser Differential in @angular/platform-server leading to SSRF Allowlist Bypass
35Monitor
CVE-2026-46417Angular: SSRF via Hostname Hijacking in @angular/platform-server
35Monitor

Published before and after this one in the same product

← EarlierCVE-2026-88059Sep 10, 2026 · Angular: Information Leak via `HttpTransferCache` Bypass When Using `withRequestsMadeViaParent`
23Monitor
← EarlierCVE-2026-88060Sep 10, 2026 · Angular: SSR XSS via Unescaped <template> Content Across DocumentFragment Boundaries in Fallback Raw-Content Elements
34Monitor
Later →CVE-2026-101896Oct 14, 2026 · Angular: Denial of Service via Numeric URL Matrix Parameters in Server-Side Rendering (SSR)
32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
npm:@angular/platform-server	20.3.31	Package registry (OSV)
npm:@angular/platform-server	21.2.23	Package registry (OSV)
npm:@angular/platform-server	22.1.6	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedOct 14, 2026
Fix recordedOct 15, 2026+1 d
TodayOct 24, 2026+10 d

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-1018960 days apartAngular: Denial of Service via Numeric URL Matrix Parameters in Server-Side Rendering (SSR)
32Monitor
CVE-2026-50171114 days apartAngular: Denial of Service (DoS) via OOM in Number Formatting (digitsInfo)
32Monitor
CVE-2026-54268114 days apartAngular: Denial of Service (DoS) via OOM in Date Formatting (formatDate)
32Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: X

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

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/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-secondary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log

Fix✗ → ✓Oct 15, 2026, 3:32 AM UTC
SSVC exploitation— → pocOct 14, 2026, 7:07 PM UTC
Exploit maturity— → noneOct 14, 2026, 4:08 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/angular/angular/commit/3db26e2544964d07a520836ad01f02f36ec88e25

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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