{"answers":{"affected":"1 open source package ship an affected version, including devplatform-spa-plugin-s3-feature-toggle.","exploited":"There is no known exploitation of MAL-2026-12778 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-2026-12778 is a malicious package in devplatform-spa-plugin-s3-feature-toggle, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12778 is a malicious package: devplatform-spa-plugin-s3-feature-toggle (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-2026-12778/ (Markdown: https://insights.sbomify.com/MAL-2026-12778/index.md)","id":"MAL-2026-12778","markdown":"https://insights.sbomify.com/MAL-2026-12778/index.md","name":"MAL-2026-12778","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"On require() of the package, index.js loads _runtime.js which selects a platform-specific endpoint, downloads a binary over HTTPS from obfuscated Cloudflare Workers subdomains (oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev), writes it to /var/tmp/.cache_\u003chex\u003e on POSIX or %TEMP%\\dotnet_diag_\u003chex\u003e.exe on Windows, chmods 0755, and spawns it detached via /bin/sh -c or cmd. Destination hostnames are reconstructed by array-join to defeat static string scanning (e.g. [\"oob-work\",\"er.cf1\",\"03-070.w\",\"orke\",\"rs\",\".d\",\"ev\"].join(\"\")). When HTTPS delivery fails, _runtime.js falls back to a DNS-tunneled channel over TXT records at sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru: it queries c.\u003cdomain\u003e for a chunk count, iterates \u003ci\u003e.\u003cdomain\u003e to retrieve base64-encoded chunks, concatenates and decodes them into a Buffer, writes the resulting binary to disk, chmods 0755, and spawns it. No hash or signature verification is performed; the payload is opaque and delivered from anonymous infrastructure; staging paths use hidden dot-file and dotnet_diag cover names; env-var opt-out gates (DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, DO_NOT_TRACK) and analytics-themed comments frame the behavior as telemetry. The combination of import-time execution, obfuscated attacker-controlled hosts, DNS-TXT covert-channel fallback, and unverified native-binary execution gives full remote code execution on the installer's host on npm install / require().","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-spa-plugin-s3-feature-toggle (npm)","id":"MAL-2026-12778","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-spa-plugin-s3-feature-toggle","purl":"pkg:npm/devplatform-spa-plugin-s3-feature-toggle","source":"MAL-2026-12778"}],"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-2026-12778/"}