css-overscroll-contain

GHSA-hjq9-gv63-8hh8

Malicious code in css-overscroll-contain (npm)

Details

**Severity:** Critical

**Affected versions:** `= 1.0.1`

## Source: amazon-inspector (5d978121f021eb6136e6a34db790556ba757de3bb8fa81981903445baf025d16)
The package advertises itself as a CSS overscroll-behavior utility but its shipped modules (thunderboltRegistry.js and sibling files named after Wix-internal registries such as siteAssetsRegistry, editorRegistry, corvidRegistry) run a self-executing IIFE at module load that performs host reconnaissance and bulk credential theft. The IIFE uses child_process.execSync and https.get/fetch to collect host identity (uname, hostname/id), file descriptors, /proc/self/mountinfo, network/DNS data, process environment variables matched by the pattern (KEY|TOKEN|SECRET|AUTH|...), and the Kubernetes service-account token at /var/run/secrets/kubernetes.io/serviceaccount/token, posting each result to the hardcoded endpoint https://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f. The same load-time code probes container-escape primitives via unshare --user --mount with devtmpfs/cgroup/release_agent mounts and a perl memfd_create+exec sequence, and ships a registry-manifest.min.json that points at static.parastorage.com/unpkg/[email protected]/ so the package resolves inside Wix thunderbolt build infrastructure. The declared package purpose, the Wix-internal export names, the attacker endpoint, and the credential-grade data flow are all incompatible with a legitimate CSS utility.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/198de23effaed79e1ee13ae86d2b350a1411ba67/osv/malicious/npm/css-overscroll-contain/MAL-2026-17705.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/198de23effaed79e1ee13ae86d2b350a1411ba67/osv/malicious/npm/css-overscroll-contain/MAL-2026-17705.json
- https://www.npmjs.com/package/css-overscroll-contain/v/1.0.1
- https://www.npmjs.com/package/css-overscroll-contain/v/1.0.2
- https://www.npmjs.com/package/css-overscroll-contain/v/1.0.3
- https://github.com/advisories/GHSA-hjq9-gv63-8hh8

Compromised versions (1)

= 1.0.1

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.