Malicious code in fabric-loader-core (npm)

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (a11b2ce0f9b1a7b7587acd21c631a72069bab0216c8bf010f4fb04f8b0ae543f) The package's postinstall hook runs index.js, which performs an HTTPS GET to the hardcoded host https://fabric-npm.gm-service.xyz/p and passes the response body directly to vm.runInContext with a context exposing require, process, Buffer, timers, and console. Whatever bytes that server returns execute at npm install time with full Node privileges on the installer's machine. The advertised purpose ("Native asset loader bridge for Fabric mod environments") does not match the code: lib/renderer.js is an inert stub with no-op exports, and index.js contains only the remote fetch-and-eval loader. The package name evokes the unrelated Fabric Minecraft mod ecosystem, which is a cover story. The remote host controls the payload and can change it at any time, so installer impact is unbounded and can include credential theft, persistence, or lateral movement. ## Source: ossf-package-analysis (d5abc604e8b7408e3be8d65f587522024ce65b390cb7746706e1032b13995cb1) The OpenSSF Package Analysis project identified 'fabric-loader-core' @ 1.0.0 (npm) as malicious. It is considered malicious because: - The package communicates with a domain associated with malicious activity.

Source published

29 Sep 2026 17:42:53 UTC

Source modified

1 Oct 2026 06:00:04 UTC

Observed here

24 Oct 2026 13:17:17 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.