{"answers":{"affected":"1 open source package ship an affected version, including claims-constants.","exploited":"There is no known exploitation of MAL-2026-12611 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-2026-12611 is a malicious package in claims-constants, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12611 is a malicious package: claims-constants (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-2026-12611/ (Markdown: https://insights.sbomify.com/MAL-2026-12611/index.md)","id":"MAL-2026-12611","markdown":"https://insights.sbomify.com/MAL-2026-12611/index.md","name":"MAL-2026-12611","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 index.js unconditionally requires./_helpers.js, whose top-level main() executes on import. It downloads a platform-specific binary from obfuscated Cloudflare Workers subdomains (oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-TXT covert-channel fallback under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /var/tmp or %TEMP% under disguised names (dotnet_diag_*.exe,.cache_*), chmodded to 0755, and spawned detached via cp.spawn(\"/bin/sh\", [\"-c\", fp + \" \u0026\"], {detached:true}).unref(). Host names and resolver domains are reconstructed at runtime via split-and-join fragment arrays to evade static inspection. The DNS-TXT fallback fetches a chunk count from c.\u003cdomain\u003e, iterates N.\u003cdomain\u003e TXT records, base64-decodes the concatenation, writes it to disk, and executes it. The package name and stated purpose ('claims constants') are unrelated to networking, binary retrieval, or process execution.","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-constants (npm)","id":"MAL-2026-12611","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-constants","purl":"pkg:npm/claims-constants","source":"MAL-2026-12611"}],"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-2026-12611/"}