Malicious code in @mastra/express (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (9cd00df32d6d56cd3d4996965ed13e18c1da3a9b0007392b4fc14da1a8fcbb46) The package's bundled distribution files (dist/index.cjs and dist/index.js) contain a `Buffer.from(..., 'base64').toString('utf-8')` decode pattern. This pattern by itself is benign and extremely common in JavaScript bundles — used for inline data URIs, JWT segment parsing, encoded SVG/PNG assets, configuration constants, and similar legitimate purposes. No corroborating evidence of credential theft, exfiltration, dropper behavior, lifecycle-script abuse, or hardcoded attacker infrastructure was observed. The match is on a single keyword pattern in a bundled main module with no traced harmful execution path. ## Source: ghsa-malware (c7375ba72b0d9da5bf4d20ab526cb654b97310e39965bea22eb5d3d0557961d4) 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 @mastra/express npm package version 1.3.31 includes bundled distribution files that contain a benign-looking base64 decode pattern. Despite the absence of direct evidence of malicious execution paths or attacker infrastructure, the package is classified as malicious by the GHSA-malware source. Systems with this package installed should be treated as fully compromised, as the package may grant attackers full control. There is no vendor advisory or patch available, and no known exploits in the wild have been reported.
Potential Impact
Any computer with @mastra/express version 1.3.31 installed or running is considered fully compromised. Attackers may have gained full control over the system, risking exposure of all stored secrets and keys. Removal of the package alone may not eliminate all malicious software introduced by the compromise.
Mitigation Recommendations
Remove the @mastra/express package version 1.3.31 immediately. Rotate all secrets and keys stored on the compromised system from a separate, trusted computer. Because full system compromise is possible, consider rebuilding or thoroughly cleaning the affected systems. No official patch or fix is available; remediation relies on removal and secret rotation.
Malicious code in @mastra/express (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (9cd00df32d6d56cd3d4996965ed13e18c1da3a9b0007392b4fc14da1a8fcbb46) The package's bundled distribution files (dist/index.cjs and dist/index.js) contain a `Buffer.from(..., 'base64').toString('utf-8')` decode pattern. This pattern by itself is benign and extremely common in JavaScript bundles — used for inline data URIs, JWT segment parsing, encoded SVG/PNG assets, configuration constants, and similar legitimate purposes. No corroborating evidence of credential theft, exfiltration, dropper behavior, lifecycle-script abuse, or hardcoded attacker infrastructure was observed. The match is on a single keyword pattern in a bundled main module with no traced harmful execution path. ## Source: ghsa-malware (c7375ba72b0d9da5bf4d20ab526cb654b97310e39965bea22eb5d3d0557961d4) 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 @mastra/express npm package version 1.3.31 includes bundled distribution files that contain a benign-looking base64 decode pattern. Despite the absence of direct evidence of malicious execution paths or attacker infrastructure, the package is classified as malicious by the GHSA-malware source. Systems with this package installed should be treated as fully compromised, as the package may grant attackers full control. There is no vendor advisory or patch available, and no known exploits in the wild have been reported.
Potential Impact
Any computer with @mastra/express version 1.3.31 installed or running is considered fully compromised. Attackers may have gained full control over the system, risking exposure of all stored secrets and keys. Removal of the package alone may not eliminate all malicious software introduced by the compromise.
Mitigation Recommendations
Remove the @mastra/express package version 1.3.31 immediately. Rotate all secrets and keys stored on the compromised system from a separate, trusted computer. Because full system compromise is possible, consider rebuilding or thoroughly cleaning the affected systems. No official patch or fix is available; remediation relies on removal and secret rotation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-6022
- Osv Schema Version
- 1.7.4
- Aliases
- ["GHSA-r6w3-xpw9-p9g6"]
- Ecosystems
- ["npm"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a50ba5068715ace4357ebd8
Added to database: 07/10/2026, 09:24:32 UTC
Last enriched: 07/10/2026, 09:41:24 UTC
Last updated: 07/21/2026, 17:26:18 UTC
Views: 7
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