{"answers":{"affected":"1 open source package ship an affected version, including claims-create-client-validator.","exploited":"There is no known exploitation of MAL-2026-12612 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-2026-12612 is a malicious package in claims-create-client-validator, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12612 is a malicious package: claims-create-client-validator (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-2026-12612/ (Markdown: https://insights.sbomify.com/MAL-2026-12612/index.md)","id":"MAL-2026-12612","markdown":"https://insights.sbomify.com/MAL-2026-12612/index.md","name":"MAL-2026-12612","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('claims-create-client-validator'), index.js loads _vendor.js whose top-level bootstrap() fetches an OS/arch-specific native binary over HTTPS from string-split-obfuscated hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS TXT fallback under *.dl.wel1.ru, writes it to /tmp/.cache_\u003chex\u003e on Unix or %TEMP%\\dotnet_diag_\u003chex\u003e.exe on Windows, chmods it 0o755, and spawns it detached via /bin/sh -c or cmd.exe. Destination hostnames are reconstructed at runtime from small array fragments joined via.join(\"\") to evade string scanning. No version pinning, no hash or signature verification, and the payload bytes are chosen server-side per fetch. The dropper is skipped only when DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, or DO_NOT_TRACK is set in the environment, and disguise filenames (dotnet_diag_*,.cache_*,.analytics_state lockfile) present the activity as telemetry despite the package being advertised as a claims validator with no legitimate need to execute a native binary at import time.","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-create-client-validator (npm)","id":"MAL-2026-12612","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-create-client-validator","purl":"pkg:npm/claims-create-client-validator","source":"MAL-2026-12612"}],"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-2026-12612/"}