CVE-2026-33943 details a high-severity code injection vulnerability in Happy DOM, a JavaScript web browser implementation, affecting versions 15.10.0 through 20.8.7. This flaw in the ECMAScriptModuleCompiler allows an attacker to achieve Remote Code Execution (RCE) by injecting unsanitized JavaScript expressions within ES module `export { }` declarations. Rated 8.8 HIGH on the CVSS scale, the vulnerability requires user interaction but can be exploited over the network with low attack complexity, leading to high impact on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, nor are public exploit modules available on platforms like Metasploit or ExploitDB. Community discussion is minimal, and the vulnerability is not listed on the CISA KEV catalog or Hot List.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 15.10.0, < 20.8.8CPE matchmatch criteria | cpe:2.3:a:capricorn86:happy_dom:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.