registry / Remote code execution / @ornikar/browserslist-config
@ornikar/browserslist-config
🦔 browserslist config files
This report shows the evidence for @ornikar/browserslist-config@8.0.4, the only known version.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiDirect source inspection confirms an unconsented preinstall bootstrap into an obfuscated payload with remote eval. This is concrete malicious behavior, not a package-aligned dependency setup.
Static reason
One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review
Trigger
npm preinstall
Impact
Arbitrary install-time code execution and potential credential theft.
Mechanism
downloads/executes Bun to run obfuscated code with remote eval
Attack narrative
On npm preinstall, setup.mjs obtains Bun if absent, then runs math_init.js. That large obfuscated payload includes an evaluated remote response and GitHub token handling, creating an install-time arbitrary-code and credential-risk chain unrelated to a browserslist configuration package.
AI rationale
Direct source inspection confirms an unconsented preinstall bootstrap into an obfuscated payload with remote eval. This is concrete malicious behavior, not a package-aligned dependency setup.
Evidence
package.jsonsetup.mjsmath_init.jsindex.jsdegraded-support.jsfull-support.js
Network endpoints1
github.com/oven-sh/bun/releases/download/bun-v1.3.13/
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- package.json preinstall runs setup.mjs.
- setup.mjs downloads Bun and executes math_init.js during install.
- math_init.js is a 728KB obfuscated payload.
- math_init.js fetches response content and evals it.
- math_init.js contains GitHub-token handling paths (ghtoken, ghs_old, ghs_jwt).
Evidence against
- Normal entrypoints only export static browserslist arrays.
- No benign package function requires an install-time runtime bootstrap or opaque payload.
Behavioral surface
ChildProcessEvalFilesystemNetworkShell
HighEntropyStringsMinifiedUrlStrings
Source & flagged code
3 flagged · loading sourcepackage.jsonView file
•scripts.preinstall = node setup.mjs
High
Install Time Lifecycle Scripts
Package defines install-time lifecycle scripts.
package.jsonView on unpkgmath_init.jsView file
1// @bun @bun-cjs
L2: var MmgoCP,etDiOOB,JqTtnbZ,bc3Kak,ZQmUTyQ,TTUgga,MDX6yrw,h8wMJNB,CabwE2L,x5ErqV;function WV8StW(MmgoCP,etDiOOB,JqTtnbZ){for(JqTtnbZ=0x0;JqTtnbZ<etDiOOB;JqTtnbZ++)MmgoCP.push(MmgoCP...
Low
Eval
Package source references a known benign dynamic code generation pattern.
math_init.jsView on unpkg · L1setup.mjsView file
•matchType = normalized_sha256
matchedPackage = @ornikar/storybook-config@12.1.2
matchedPath = setup.mjs
matchedIdentity = npm:[redacted]:12.1.2
similarity = 1.000
summary = normalized source hash matched finalized malicious source
Findings
2 High2 Medium5 Low
HighInstall Time Lifecycle Scriptspackage.json
HighKnown Malware Source Similaritysetup.mjs
MediumNetwork
MediumStructural Risk Force Deep Review
LowScripts Present
LowEvalmath_init.js
LowFilesystem
LowHigh Entropy Strings
LowUrl Strings
Affected versions and remediation
This report applies to @ornikar/browserslist-config@8.0.4.
The versions list below shows the verdict for each recorded version.
- Avoid installing @ornikar/browserslist-config@8.0.4. 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: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.