Skip to main content

Malicious code in pfa-prettier-config (npm)

0
Critical
Published: 08/05/2026 (08/05/2026, 12:49:16 UTC)
Source: GCVE Database
Product: pfa-prettier-config

Description

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (08f4b65c7534427cd8814e8c85a84b11c2201d10724c34bb99987bae83e0c5cc) The package is published as 'pfa-prettier-config' with description 'environment config reader', but contains no Prettier configuration or config-reading code. index.js unconditionally requires./_platform on load. _platform.js selects a per-OS asset path, fetches bytes from one of four Cloudflare Workers hosts (oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev) — with hostnames reassembled at runtime via string-concat (e.g. ["oob-worker.cf","102-baf.workers.dev"].join("")) — and falls back to a chunked DNS TXT download from tin.dl.well1.site. The fetched bytes are written to /var/tmp/.cache_<hex> or %TEMP%/dotnet_diag_<hex>.exe under cover names, chmod'd 0755, and spawned detached via cp.spawn('/bin/sh', ['-c', fp+' &'], {detached:true}).unref() or spawn('cmd',...). A second dropper is shipped in lib/telemetry.js (~81KB, disguised as an 'Analytics SDK') containing the same primitives (base64 chunk decode, chmodSync 0755 on 'extensionPath', cp.spawn('/bin/sh', ['-c', filePath+' &'])), with child_process required via the computed string require('child_'+'process'). Requiring or importing this package triggers download-and-execute of an attacker-hosted OS-specific binary. ## Source: ghsa-malware (3d367f5160b47afe3e72f884621b4a8f8946a3a07dfcd5c4c9fbd659c57a2b2a) 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

npmghsa
pfa-prettier-config
Affected versions
=20.9.1

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 08/05/2026, 17:24:36 UTC

Technical Analysis

The 'pfa-prettier-config' npm package (version 20.9.1) is a malicious package that, upon being required or imported, downloads OS-specific binaries from attacker-controlled Cloudflare Workers endpoints or DNS TXT records. It writes these binaries to temporary locations with executable permissions and executes them detached from the main process using shell commands. The package contains two main malicious components: index.js, which triggers the initial download and execution, and lib/telemetry.js, a secondary dropper disguised as an analytics SDK that uses similar techniques to execute attacker payloads. This behavior enables remote code execution on the host system when the package is used.

Potential Impact

This package enables remote code execution on the host system by downloading and executing attacker-controlled binaries without user consent. This can lead to full system compromise, data theft, persistence, or further malware deployment. Since the malicious code executes automatically upon requiring or importing the package, any project depending on this package is at immediate risk.

Mitigation Recommendations

No official patch or remediation is currently available for this malicious package. Users should immediately remove 'pfa-prettier-config' version 20.9.1 from their projects and dependency trees. Avoid installing or using this package. Review dependency sources carefully and consider using trusted package registries or verified packages. Monitor for any suspicious activity on systems where this package was installed and perform incident response as needed.

Pro Console: star threats, build custom feeds, automate alerts via Slack, email & webhooks.Upgrade to Pro

Technical Details

Gcve Source
db.gcve.eu
Osv Id
MAL-2026-12407
Osv Schema Version
1.7.4
Ecosystems
["npm"]

Threat ID: 6a735745bf8831d539159f04

Added to database: 08/05/2026, 15:31:17 UTC

Last enriched: 08/05/2026, 17:24:36 UTC

Last updated: 09/07/2026, 23:51:39 UTC

Views: 17

Community Reviews

0 reviews

Crowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.

Sort by
Loading community insights…

Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.

Actions

PRO

Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.

Please log in to the Console to use AI analysis features.

Need more coverage?

Upgrade to Pro Console for AI refresh and higher limits.

For incident response and remediation, OffSeq services can help resolve threats faster.

Latest Threats

Breach by OffSeqOFFSEQFRIENDS — 25% OFF

Check if your credentials are on the dark web

Instant breach scanning across billions of leaked records. Free tier available.

Scan now
OffSeq TrainingCredly Certified

Lead Pen Test Professional

Technical5-day eLearningPECB Accredited
View courses