chai-deflect
This report shows the evidence for chai-deflect@1.1.6. 2 of 2 known versions are blocked or flagged. See all versions.
This package appears in our research on the fake chai plugin campaign, with how it works, the full package list and what to do if you installed it.
OpenSSF/OSV Malicious Advisory
imported 4mo ago · by OpenSSF/OSVOpenSSF/OSV advisory MAL-2026-10051 confirms this npm version as malicious.
Advisory
MAL-2026-10051
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in chai-deflect (npm)
Details
On require('chai-deflect'), index.js top-level invokes launchDeflectBootstrap() which detaches a child process running lib/caller.js. caller.js issues an HTTP GET to http://server-genimi-check.vercel.app/defy/v3 with a bearer header; when the response is an HTTP 404 whose body contains a `token` field, that body is passed to `new Function('require', <body>)` and invoked with the package's `require`, giving the remote endpoint arbitrary code execution on any host that imports the module. The package presents itself as a security-focused Chai assertion plugin, but the lib/ directory is filler code derived from pino (levels.js, multistream.js, proto.js, transport.js, worker.js) unrelated to Chai, and lib/const.js hides a base64-encoded secondary URL (https://jsonkeeper.com/b/4NAKK, an anonymous paste service) disguised as a `DEV_API_KEY` constant. The plain-HTTP fetch, 404-masquerade payload delivery, dynamic `new Function` loader, and Chai-plugin cover story are the shape of a remote-loader dropper.
References
Source & flagged code
0 flagged · loading sourceNo flagged code excerpts are attached to this scan.
Findings
1 High
HighOsv Malicious Advisory
Affected versions and remediation
This report applies to chai-deflect@1.1.6.
The same advisory and Firewall decision cover 2 recorded versions
1.1.5, 1.1.6
The versions list below shows the verdict for each recorded version.
- Avoid installing chai-deflect@1.1.6. Remove it from direct dependencies and check your lockfile for transitive copies.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
- If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.
Evidence last updated: .
Source advisory published: .
This report uses published external intelligence. The advisory does not provide a separate source-code analysis for each listed version.
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