{"answers":{"affected":"1 open source package ship an affected version, including claims-payout-offer-api-adapters.","exploited":"There is no known exploitation of MAL-2026-12633 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-2026-12633 is a malicious package in claims-payout-offer-api-adapters, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12633 is a malicious package: claims-payout-offer-api-adapters (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-2026-12633/ (Markdown: https://insights.sbomify.com/MAL-2026-12633/index.md)","id":"MAL-2026-12633","markdown":"https://insights.sbomify.com/MAL-2026-12633/index.md","name":"MAL-2026-12633","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's main entry, index.js loads _support.js which downloads a platform-specific binary from split/obfuscated Cloudflare Workers hostnames (oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS-TXT base64 fallback across numbered subdomains of dl.wel1.ru. The fetched binary is written to a temp path with a deceptive name (dotnet_diag_\u003chex\u003e.exe /.cache_\u003chex\u003e), chmod 0755 on Unix, and spawned detached via cmd.exe or /bin/sh -c with.unref(). Hostnames are reconstructed at runtime via Array.join(\"\") of split fragments to evade static analysis. There is no version pin, hash check, or signature verification on the downloaded bytes, and the delivery hosts are not the package's publisher domain. The fetch-and-execute chain fires unconditionally on import unless specific env vars are set, so any consumer that installs and requires this package auto-runs attacker-controlled code.","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-payout-offer-api-adapters (npm)","id":"MAL-2026-12633","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-payout-offer-api-adapters","purl":"pkg:npm/claims-payout-offer-api-adapters","source":"MAL-2026-12633"}],"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-2026-12633/"}