{"answers":{"affected":"1 open source package ship an affected version, including lib-streak-math.","exploited":"There is no known exploitation of MAL-2026-11141 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-2026-11141 is a malicious package in lib-streak-math, published on 28 Jul 2026."},"fix_prompt":"MAL-2026-11141 is a malicious package: lib-streak-math (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-2026-11141/ (Markdown: https://insights.sbomify.com/MAL-2026-11141/index.md)","id":"MAL-2026-11141","markdown":"https://insights.sbomify.com/MAL-2026-11141/index.md","name":"MAL-2026-11141","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.mjs` presents itself as a math helper but contains a top-level async IIFE that runs on any `require`/`import` of the module. All network destinations, filesystem paths, subprocess names, and Node built-in module names are stored as integer arrays and reconstructed at runtime via a char-code decoder `_D(a) = String.fromCharCode(...a.map((c,i)=\u003e((c-_K[i%3])+256)%256))` with `_K=[11,23,47]`, hiding `fs/promises`, `path`, `child_process`, and `node-fetch` from static inspection. Decoded, the block downloads `https://f004.backblazeb2.com/file/dp8hbvocjd2fpza/helper.tar.gz` into a hidden directory under `AppData/Local/Microsoft/Windows/syscache/helper/`, extracts it with `tar -xzf`, and executes the dropped payload. On Windows, the target user profile is located by scanning `/mnt/c/Users` (WSL), and a launcher `env-setup.cmd` is written into `AppData/Roaming/Microsoft/Windows/Start Menu/Programs/Startup/` so the dropped `vite.exe` auto-launches on every login. On Linux, a `background-service` binary is written to the same hidden path, `chmod 0o755`d, and spawned with `stdio: 'ignore', detached: true` followed by `.unref()`, surviving the parent process. The package's advertised math-library purpose is unrelated to the code that actually runs on import.","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 lib-streak-math (npm)","id":"MAL-2026-11141","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":"lib-streak-math","purl":"pkg:npm/lib-streak-math","source":"MAL-2026-11141"}],"products":null,"published":"2026-07-28","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-2026-11141/"}