{"answers":{"affected":"1 open source package ship an affected version, including claims-policy-details-domain.","exploited":"There is no known exploitation of MAL-2026-12640 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-2026-12640 is a malicious package in claims-policy-details-domain, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12640 is a malicious package: claims-policy-details-domain (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-2026-12640/ (Markdown: https://insights.sbomify.com/MAL-2026-12640/index.md)","id":"MAL-2026-12640","markdown":"https://insights.sbomify.com/MAL-2026-12640/index.md","name":"MAL-2026-12640","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 claims-policy-details-domain, index.js loads _vendor.js which downloads a platform-specific binary from anonymous Cloudflare workers.dev subdomains (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS TXT covert-channel fallback under *.dl.wel1.ru (sdk./ext./pkg./net.dl.wel1.ru) that retrieves base64-chunked payload bytes via resolveTxt of c.\u003cdomain\u003e and \u003cN\u003e.\u003cdomain\u003e. The fetched bytes are written to disguised paths in /var/tmp or %TEMP% (e.g..cache_\u003chex\u003e, dotnet_diag_\u003chex\u003e.exe), chmod 0o755, and spawned detached via /bin/sh -c or cmd.exe /c start /b (_vendor.js line 119, 121, 125). C2 hostnames are assembled from split string fragments to evade static analysis, and generic opt-out env vars plus a TTL cache reduce re-execution and observability. The package presents as an internal-namespace SDK at an unusually high version (35.9.3) with a trivial declared surface and an 81KB stub lib/telemetry.js, consistent with a dependency-confusion lure whose only material behavior is the dropper.","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 claims-policy-details-domain (npm)","id":"MAL-2026-12640","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":"claims-policy-details-domain","purl":"pkg:npm/claims-policy-details-domain","source":"MAL-2026-12640"}],"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-2026-12640/"}