{"answers":{"affected":"1 open source package ship an affected version, including boxy-wrapper-webpack-plugin.","exploited":"There is no known exploitation of MAL-2026-13099 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-2026-13099 is a malicious package in boxy-wrapper-webpack-plugin, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-13099 is a malicious package: boxy-wrapper-webpack-plugin (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-2026-13099/ (Markdown: https://insights.sbomify.com/MAL-2026-13099/index.md)","id":"MAL-2026-13099","markdown":"https://insights.sbomify.com/MAL-2026-13099/index.md","name":"MAL-2026-13099","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 entrypoint (index.js) unconditionally requires./_compat.js, whose top-level main() reconstructs obfuscated Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev) and vendor-lookalike domains (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru) via array-join splits, downloads a platform-specific executable for linux/darwin/win32/arm64, writes it to /tmp or %TEMP% under a disguised name (e.g. dotnet_diag_*.exe,.cache_*), chmods 0755, and detached-spawns it via /bin/sh -c or cmd /c start. A DNS-TXT chunked base64 channel is used as a fallback delivery path. A second, structurally identical dropper is bundled at lib/telemetry.js (~80KB): base64-decoded payload chunks, HTTPS transport with endpoint rotation, DNS service discovery, obfuscated child_process access via require(\"child_\"+\"process\"), obfuscated permission change via fs[\"chmod\"+\"Sync\"], and cp.spawn(\"/bin/sh\", [\"-c\", filePath+\" \u0026\"]). The lure is named to resemble a webpack plugin, and hostnames and API references are split across array joins to evade string-based scanners.","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 boxy-wrapper-webpack-plugin (npm)","id":"MAL-2026-13099","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":"boxy-wrapper-webpack-plugin","purl":"pkg:npm/boxy-wrapper-webpack-plugin","source":"MAL-2026-13099"}],"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-2026-13099/"}