CVE-2026-33943 | happy-dom 15.10.2/20.0.0/20.0.2 ECMAScriptModuleCompiler code injection

VDB-353829 · CVE-2026-33943 · GCVE-0-2026-33943 HAPPY-DOM 15.10.2/20.0.0/20.0.2 ECMASCRIPTMODULECOMPILER CODE INJECTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.0 $0-$5k 3.77+ Summaryinfo A vulnerability was found in happy-dom. It has been rated as critical. This vulnerability affects unknown code of the component ECMAScriptModuleCompiler. Performing a manipulation results in code injection. This vulnerability is cataloged as CVE-2026-33943. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised. Detailsinfo A vulnerability, which was classified as critical, was found in happy-dom. This affects an unknown function of the component ECMAScriptModuleCompiler. The manipulation with an unknown input leads to a code injection vulnerability. CWE is classifying the issue as CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. This is going to have an impact on confidentiality, integrity, and availability. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-33943. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059 for this issue. Upgrading to version 20.8.8 eliminates this vulnerability. Productinfo Name happy-dom Version 15.10.2 20.0.0 20.0.2 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 6.0 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Code injection CWE: CWE-94 / CWE-74 / CWE-707 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: happy-dom 20.8.8 Timelineinfo 03/27/2026 Advisory disclosed 03/27/2026 +0 days VulDB entry created 03/27/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Confirmed CVE: CVE-2026-33943 (🔒) GCVE (CVE): GCVE-0-2026-33943 GCVE (VulDB): GCVE-100-353829 Entryinfo Created: 03/27/2026 07:34 Changes: 03/27/2026 07:34 (51) Complete: 🔍 Cache ID: 99:3DC:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸