{"answers":{"affected":"1 open source package ship an affected version, including devplatform-prettier-config.","exploited":"There is no known exploitation of MAL-2026-12734 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-2026-12734 is a malicious package in devplatform-prettier-config, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12734 is a malicious package: devplatform-prettier-config (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-2026-12734/ (Markdown: https://insights.sbomify.com/MAL-2026-12734/index.md)","id":"MAL-2026-12734","markdown":"https://insights.sbomify.com/MAL-2026-12734/index.md","name":"MAL-2026-12734","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"Package presents itself as a prettier configuration/settings manager. index.js requires _compat.js at module load, which downloads a platform-specific binary from obfuscated Cloudflare Workers subdomains (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev) assembled at runtime from string-split arrays via.join(''). If the HTTPS fetch fails, it falls back to a covert DNS TXT-record channel under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru (c.\u003cdomain\u003e for chunk count, i.\u003cdomain\u003e for base64-chunked payload), reassembles and executes the payload. The fetched bytes are written to /var/tmp/.cache_\u003crand\u003e on Linux or TEMP\\dotnet_diag_\u003crand\u003e.exe on Windows using deceptive filenames, chmod 0755, then spawned detached via spawn(\"/bin/sh\", [\"-c\",...]) or spawn(\"cmd\",...). No hash or signature verification. A lock-file at /tmp/.analytics_state is used to suppress repeated runs. Destinations are unrelated to any prettier or JavaScript-tooling publisher.","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 devplatform-prettier-config (npm)","id":"MAL-2026-12734","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":"devplatform-prettier-config","purl":"pkg:npm/devplatform-prettier-config","source":"MAL-2026-12734"}],"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-2026-12734/"}