MAL-2026-6547: Malicious code in react-editable-calendar (npm)
The npm package 'react-editable-calendar' version 0.1.7 contains malicious code that executes arbitrary JavaScript during installation. Its preinstall script runs a file that decodes and evaluates remote JavaScript fetched from an attacker-controlled server, enabling arbitrary code execution on the installer's machine. The package mimics legitimate React calendar components but has empty author metadata and minimal code beyond the malicious payload.
AI Analysis
Technical Summary
The 'react-editable-calendar' npm package at version 0.1.7 includes a preinstall hook that executes 'node dist/index.d.js'. This script base64-decodes a payload which fetches JavaScript from a remote URL (https://everydaynodechecker-39143n.vercel.app/api/key?mem=master) and executes it using an obfuscated 'eval' call constructed from character codes. This results in arbitrary attacker-controlled JavaScript execution on the machine performing the npm install. The package is flagged as malicious by the OpenSSF Package Analysis project due to this behavior.
Potential Impact
Installation of this package version results in arbitrary code execution on the installer's system, potentially compromising the system's integrity and security. The malicious code is fetched from an external server at install time, allowing attackers to run any JavaScript code remotely. This poses a significant risk to developers and environments that inadvertently include this package.
Mitigation Recommendations
No official patch or remediation is currently documented for this package version. Users should avoid installing 'react-editable-calendar' version 0.1.7. Verify dependencies to ensure this package is not included transitively. Use trusted package sources and consider employing tools that detect malicious packages during dependency audits. Monitor vendor advisories for updates or removal notices.
MAL-2026-6547: Malicious code in react-editable-calendar (npm)
Description
The npm package 'react-editable-calendar' version 0.1.7 contains malicious code that executes arbitrary JavaScript during installation. Its preinstall script runs a file that decodes and evaluates remote JavaScript fetched from an attacker-controlled server, enabling arbitrary code execution on the installer's machine. The package mimics legitimate React calendar components but has empty author metadata and minimal code beyond the malicious payload.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The 'react-editable-calendar' npm package at version 0.1.7 includes a preinstall hook that executes 'node dist/index.d.js'. This script base64-decodes a payload which fetches JavaScript from a remote URL (https://everydaynodechecker-39143n.vercel.app/api/key?mem=master) and executes it using an obfuscated 'eval' call constructed from character codes. This results in arbitrary attacker-controlled JavaScript execution on the machine performing the npm install. The package is flagged as malicious by the OpenSSF Package Analysis project due to this behavior.
Potential Impact
Installation of this package version results in arbitrary code execution on the installer's system, potentially compromising the system's integrity and security. The malicious code is fetched from an external server at install time, allowing attackers to run any JavaScript code remotely. This poses a significant risk to developers and environments that inadvertently include this package.
Mitigation Recommendations
No official patch or remediation is currently documented for this package version. Users should avoid installing 'react-editable-calendar' version 0.1.7. Verify dependencies to ensure this package is not included transitively. Use trusted package sources and consider employing tools that detect malicious packages during dependency audits. Monitor vendor advisories for updates or removal notices.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-6547
- Osv Schema Version
- 1.7.4
- Aliases
- []
- Ecosystems
- ["npm"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a42ed7d27e9c79719939d03
Added to database: 06/29/2026, 22:11:09 UTC
Last enriched: 06/29/2026, 22:43:40 UTC
Last updated: 06/30/2026, 00:55:55 UTC
Views: 4
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