Malicious code in prettier_v2 (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (52d6c46e6d7e7ba0269dbb3d9725b5943d1b4b94ac2587a5738983cb93d8e1cf) Package name 'prettier_v2' closely resembles the widely-used 'prettier' formatter package, raising typosquat concerns. The file lib/mirror.js contains a Buffer.from(..., 'base64').toString('utf8') decode pattern, which is commonly used to hide payload strings or code. Without confirmation of how the decoded content is used (data vs. eval/exec), intent cannot be conclusively determined, but the combination of a confusable package name and obfuscated string handling warrants human review before installation. ## Source: ghsa-malware (b0da6eb947f9a9046563fe43e0b5064d7dc2a75e019425a564276d44d39bc263) 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 'prettier_v2' package on npm, specifically version 3.8.5, is a malicious typosquatting package designed to impersonate the legitimate 'prettier' formatter. It includes obfuscated code in the file lib/mirror.js that decodes base64-encoded strings, a common technique to conceal malicious payloads. Although the exact execution method of the decoded content is not confirmed, the presence of such obfuscation combined with the confusable package name strongly indicates malicious intent. According to the GHSA advisory, any system with this package installed should be considered fully compromised, necessitating immediate secret and key rotations and thorough remediation beyond simple package removal.
Potential Impact
Systems with the 'prettier_v2' package version 3.8.5 installed are at risk of full compromise. Attackers may gain control over the affected system, potentially accessing or exfiltrating sensitive information such as secrets and keys. The compromise may persist even after removal of the package, indicating possible installation of additional malicious software or backdoors.
Mitigation Recommendations
Remove the 'prettier_v2' package version 3.8.5 immediately from all affected systems. Rotate all secrets and keys stored on compromised systems from a separate, secure environment. Conduct a thorough investigation and remediation of the affected systems to identify and remove any additional malicious software or persistence mechanisms. Monitor for any suspicious activity related to this compromise. Patch status is not applicable as this is a malicious package rather than a vulnerability in legitimate software.
Malicious code in prettier_v2 (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (52d6c46e6d7e7ba0269dbb3d9725b5943d1b4b94ac2587a5738983cb93d8e1cf) Package name 'prettier_v2' closely resembles the widely-used 'prettier' formatter package, raising typosquat concerns. The file lib/mirror.js contains a Buffer.from(..., 'base64').toString('utf8') decode pattern, which is commonly used to hide payload strings or code. Without confirmation of how the decoded content is used (data vs. eval/exec), intent cannot be conclusively determined, but the combination of a confusable package name and obfuscated string handling warrants human review before installation. ## Source: ghsa-malware (b0da6eb947f9a9046563fe43e0b5064d7dc2a75e019425a564276d44d39bc263) 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 'prettier_v2' package on npm, specifically version 3.8.5, is a malicious typosquatting package designed to impersonate the legitimate 'prettier' formatter. It includes obfuscated code in the file lib/mirror.js that decodes base64-encoded strings, a common technique to conceal malicious payloads. Although the exact execution method of the decoded content is not confirmed, the presence of such obfuscation combined with the confusable package name strongly indicates malicious intent. According to the GHSA advisory, any system with this package installed should be considered fully compromised, necessitating immediate secret and key rotations and thorough remediation beyond simple package removal.
Potential Impact
Systems with the 'prettier_v2' package version 3.8.5 installed are at risk of full compromise. Attackers may gain control over the affected system, potentially accessing or exfiltrating sensitive information such as secrets and keys. The compromise may persist even after removal of the package, indicating possible installation of additional malicious software or backdoors.
Mitigation Recommendations
Remove the 'prettier_v2' package version 3.8.5 immediately from all affected systems. Rotate all secrets and keys stored on compromised systems from a separate, secure environment. Conduct a thorough investigation and remediation of the affected systems to identify and remove any additional malicious software or persistence mechanisms. Monitor for any suspicious activity related to this compromise. Patch status is not applicable as this is a malicious package rather than a vulnerability in legitimate software.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-5846
- Osv Schema Version
- 1.7.4
- Aliases
- ["GHSA-cmfj-34j9-8w66"]
- Ecosystems
- ["npm"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a50ba5968715ace4357ef4f
Added to database: 07/10/2026, 09:24:41 UTC
Last enriched: 07/10/2026, 09:43:49 UTC
Last updated: 07/31/2026, 09:40:16 UTC
Views: 6
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