Malicious code in @yongot/canary-mcp-isolation (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (6ff9f45262c13bea579ed092cabfb043896d60c89787301b73eef78848802574) package.json declares a postinstall script that runs beacon.js, and index.js also requires beacon.js on load. beacon.js POSTs the installer's os.hostname(), a persisted run marker read from os.tmpdir(), and stage info to a hardcoded webhook.site collector at https://webhook.site/b76376f8-118e-44f1-a5ee-8a73f55b137b, and additionally probes the cloud instance metadata service at 169.254.169.254 and metadata.google.internal with the Metadata-Flavor: Google header. The exfiltration fires automatically on npm install and again on import, with no consent gating and no caller-configurable destination. The package's self-description as a benign canary for authorized testing does not change the behavior: any environment that installs this package sends host identifiers and cloud-metadata reachability to a third-party webhook endpoint controlled by whoever holds that UUID.
Malicious code in @yongot/canary-mcp-isolation (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (6ff9f45262c13bea579ed092cabfb043896d60c89787301b73eef78848802574) package.json declares a postinstall script that runs beacon.js, and index.js also requires beacon.js on load. beacon.js POSTs the installer's os.hostname(), a persisted run marker read from os.tmpdir(), and stage info to a hardcoded webhook.site collector at https://webhook.site/b76376f8-118e-44f1-a5ee-8a73f55b137b, and additionally probes the cloud instance metadata service at 169.254.169.254 and metadata.google.internal with the Metadata-Flavor: Google header. The exfiltration fires automatically on npm install and again on import, with no consent gating and no caller-configurable destination. The package's self-description as a benign canary for authorized testing does not change the behavior: any environment that installs this package sends host identifiers and cloud-metadata reachability to a third-party webhook endpoint controlled by whoever holds that UUID.
Affected software
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Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-16061
- Osv Schema Version
- 1.7.4
- Ecosystems
- ["npm"]
Threat ID: 6ab1e215f7a7c5410644c7eb
Added to database: 09/22/2026, 02:04:05 UTC
Last updated: 09/22/2026, 02:04:05 UTC
Views: 1
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