CVE-2026-101895
Angular SSR: Denial of Service (DoS) via Infinite Loop on Malformed DOCTYPE
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 4.0 | High8.7 | 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 |
| NVDNVD · Awaiting Analysis | 4.0 | High8.7 | 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 |
- EPSS (exploitation in 30 days)
- 0.87% · top 41% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.7.
Weakness
Affected products
- affected <= 19.2.25
- affected >= 20.0.0, < 20.3.31
- affected >= 21.0.0, < 21.2.23
- affected >= 22.0.0, < 22.1.6
- affected <= 19.2.25
- affected >= 20.0.0, < 20.3.31
- affected >= 21.0.0, < 21.2.23
- affected >= 22.0.0, < 22.1.6
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npm@angular/platform-serverGHSA-f67j-2jqw-jpq7 (opens in a new tab)
References (7)
- https://github.com/angular/angular/security/advisories/GHSA-f67j-2jqw-jpq7 (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/angular/angular/commit/3db26e2544964d07a520836ad01f02f36ec88e25 (opens in a new tab)x_refsource_MISC
- https://github.com/angular/angular/commit/fc2e8fbc0bda2f5c11585e8a0cbd88c074f5e567 (opens in a new tab)x_refsource_MISC
- https://github.com/angular/domino/commit/4d97473116d000e3fd4d6f75ec98cbd67576fa6f (opens in a new tab)x_refsource_MISC
- https://github.com/angular/angular/releases/tag/v20.3.31 (opens in a new tab)x_refsource_MISC
- https://github.com/angular/angular/releases/tag/v21.2.23 (opens in a new tab)x_refsource_MISC
- https://github.com/angular/angular/releases/tag/v22.1.6 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-f67j-2jqw-jpq7 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-101895)Record last updated .