OpenSSF/OSV advisory MAL-2026-12487 confirms this npm version as malicious. The package's main entry (index.js) has a side-effect require of _bridge.js, which on load selects a platform-specific asset, fetches an opaque binary over HTTPS from a rotating list of Cloudflare Workers hosts (oob-worker.cf*.workers.dev and *.dl.well1.site, assembled via array-join string-splitting to evade static matching, with a DNS-over-TXT fallback that base64-reassembles the payload URL from TXT records),...
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in travel-core-utils-object (npm)
Details
The package's main entry (index.js) has a side-effect require of _bridge.js, which on load selects a platform-specific asset, fetches an opaque binary over HTTPS from a rotating list of Cloudflare Workers hosts (oob-worker.cf*.workers.dev and *.dl.well1.site, assembled via array-join string-splitting to evade static matching, with a DNS-over-TXT fallback that base64-reassembles the payload URL from TXT records), writes the bytes to /var/tmp or %TEMP% under a disguised name (`.cache_<hex>` on POSIX, `dotnet_diag_<hex>.exe` on Windows), chmods 0755, and spawns it detached via `/bin/sh -c "<path> &"` or `cmd`. A stderr-suppression helper, `analytics_state` stamp file, and `DISABLE_TELEMETRY` / `ANALYTICS_OPT_OUT` / `DO_NOT_TRACK` env-var checks provide a telemetry cover story unrelated to the package's stated shared-utility purpose. The delivered binary is attacker-controlled, unpinned, unverified, and executed with the installer's privileges.
Decision reason
OpenSSF Malicious Packages via OSV confirms travel-core-utils-object@20.3.4 as malicious (MAL-2026-12487): Malicious code in travel-core-utils-object (npm)