{"answers":{"affected":"1 open source package ship an affected version, including bigops-chat-files-hub-client.","exploited":"There is no known exploitation of MAL-2026-12155 in the wild and no public exploit code.","fix":"Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.","what":"MAL-2026-12155 is a malicious package in bigops-chat-files-hub-client, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12155 is a malicious package: bigops-chat-files-hub-client (npm). Every version was published to cause harm.\n\nTask:\n1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.\n2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.\n3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.\n4. If the package is not used anywhere, say so and change nothing.\n\nReference: https://insights.sbomify.com/MAL-2026-12155/ (Markdown: https://insights.sbomify.com/MAL-2026-12155/index.md)","id":"MAL-2026-12155","markdown":"https://insights.sbomify.com/MAL-2026-12155/index.md","name":"MAL-2026-12155","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"The package's main entry index.js require()s./_shim, which on load fetches a platform-specific binary from obfuscated Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev) with a *.dl.wel1.ru fallback, writes it to a temp path as dotnet_diag_\u003chex\u003e.exe or.cache_\u003chex\u003e, chmods it 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. Destination hostnames are reconstructed at runtime from split string fragments joined with.join(\"\") to hide them from static inspection. A second dropper module lib/telemetry.js (81 KB) ships in the tarball with the same base64-chunk decode + spawn + chmod 0755 mechanics wrapped in Sentry-like class names; it is not on the reachable require() graph in this version but is present for future activation. Telemetry-themed filenames and opt-out env vars (DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, DO_NOT_TRACK) provide cover. The stated purpose (chat files hub client) has no legitimate need to fetch and execute native binaries from anonymous edge-worker hosts.","ecosystems":["npm"],"exploits":{"exploitdb":null,"first_seen":null,"github_poc":null,"max_poc_stars":null,"metasploit":null,"nuclei":null,"refs":[],"tier":null},"has_fix":false,"headline":"Malicious code in bigops-chat-files-hub-client (npm)","id":"MAL-2026-12155","indexable":true,"kev":null,"kind":"malicious","links":{"ecosystem":"npm","product":null,"products":[],"type":null,"year":"2026"},"n_packages":1,"n_references":null,"packages":[{"ecosystem":"npm","fixed":[],"introduced":[],"last_affected":[],"package":"bigops-chat-files-hub-client","purl":"pkg:npm/bigops-chat-files-hub-client","source":"MAL-2026-12155"}],"products":null,"published":"2026-08-05","related":[],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"OpenSSF Malicious Packages","prefix":"MAL"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":null,"updated":null,"vendors":null},"summary":null,"url":"https://insights.sbomify.com/MAL-2026-12155/"}