Malicious code in browserslist-db-sync (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (1aae0de7cc1570688be06b2633a5650b55b99b3abb07029100d6c79d7e3f31da) lib/mirror.js line 13 contains a Buffer.from(..., "base64").toString("utf8") pattern. This decoding primitive is common in benign code (parsing JWTs, decoding configuration, handling embedded assets) but is also used to obfuscate hardcoded URLs, payloads, or credentials. Contextual tracing of how the decoded value is used did not complete, so intent cannot be determined from the available evidence. The package name suggests a browserslist database mirror/sync utility; a human reviewer should confirm whether the decoded data is benign content (configuration, mirror URL) or hides attacker-controlled strings or executable payload. ## Source: ghsa-malware (1e7eebaf0ec5e5d89501d240e0e11dfd758c9a9c6bcaf74a29a2dcabf1a1f502) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
AI Analysis
Technical Summary
The browserslist-db-sync npm package versions 1.0.4 and 1.0.6 have been identified as containing malicious code. Analysis detected use of base64 decoding patterns commonly used for obfuscation, which may conceal attacker-controlled URLs, payloads, or credentials. The package is considered a malicious package that, once installed, can lead to full compromise of the host system. The advisory from ghsa-malware states that any system with this package installed should be treated as fully compromised, with immediate secret rotation and package removal recommended. No official patch or fix is currently available.
Potential Impact
Any computer with the affected versions of browserslist-db-sync installed or running is considered fully compromised. Attackers may have gained full control, potentially exposing all stored secrets and keys. The presence of this package indicates a severe security breach with potential for persistent malicious activity beyond the package itself.
Mitigation Recommendations
Remove the browserslist-db-sync package versions 1.0.4 and 1.0.6 immediately. Rotate all secrets and keys stored on the compromised system from a separate, trusted machine. Because full system compromise is likely, conduct a thorough investigation and consider rebuilding the affected system. No official patch or fix is currently available; rely on removal and secret rotation as primary mitigations.
Malicious code in browserslist-db-sync (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (1aae0de7cc1570688be06b2633a5650b55b99b3abb07029100d6c79d7e3f31da) lib/mirror.js line 13 contains a Buffer.from(..., "base64").toString("utf8") pattern. This decoding primitive is common in benign code (parsing JWTs, decoding configuration, handling embedded assets) but is also used to obfuscate hardcoded URLs, payloads, or credentials. Contextual tracing of how the decoded value is used did not complete, so intent cannot be determined from the available evidence. The package name suggests a browserslist database mirror/sync utility; a human reviewer should confirm whether the decoded data is benign content (configuration, mirror URL) or hides attacker-controlled strings or executable payload. ## Source: ghsa-malware (1e7eebaf0ec5e5d89501d240e0e11dfd758c9a9c6bcaf74a29a2dcabf1a1f502) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The browserslist-db-sync npm package versions 1.0.4 and 1.0.6 have been identified as containing malicious code. Analysis detected use of base64 decoding patterns commonly used for obfuscation, which may conceal attacker-controlled URLs, payloads, or credentials. The package is considered a malicious package that, once installed, can lead to full compromise of the host system. The advisory from ghsa-malware states that any system with this package installed should be treated as fully compromised, with immediate secret rotation and package removal recommended. No official patch or fix is currently available.
Potential Impact
Any computer with the affected versions of browserslist-db-sync installed or running is considered fully compromised. Attackers may have gained full control, potentially exposing all stored secrets and keys. The presence of this package indicates a severe security breach with potential for persistent malicious activity beyond the package itself.
Mitigation Recommendations
Remove the browserslist-db-sync package versions 1.0.4 and 1.0.6 immediately. Rotate all secrets and keys stored on the compromised system from a separate, trusted machine. Because full system compromise is likely, conduct a thorough investigation and consider rebuilding the affected system. No official patch or fix is currently available; rely on removal and secret rotation as primary mitigations.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-5842
- Osv Schema Version
- 1.7.4
- Aliases
- ["GHSA-mfw9-5hqc-vc53"]
- Ecosystems
- ["npm"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a50ba5c68715ace4357efe6
Added to database: 07/10/2026, 09:24:44 UTC
Last enriched: 07/10/2026, 09:45:04 UTC
Last updated: 07/26/2026, 18:35:30 UTC
Views: 7
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