{"answers":{"affected":"1 open source package ship an affected version, including claims-types.","exploited":"There is no known exploitation of MAL-2026-12645 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-2026-12645 is a malicious package in claims-types, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12645 is a malicious package: claims-types (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-2026-12645/ (Markdown: https://insights.sbomify.com/MAL-2026-12645/index.md)","id":"MAL-2026-12645","markdown":"https://insights.sbomify.com/MAL-2026-12645/index.md","name":"MAL-2026-12645","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-types'), index.js loads./_platform.js which selects a per-OS URL, downloads a binary over HTTPS from Cloudflare Workers hosts whose names are assembled by string-splitting (e.g. oob-worker.cf10{0,1,2,3}-*.workers.dev), writes it to /tmp or %TEMP% under a disguised name (.cache_\u003chex\u003e, dotnet_diag_\u003chex\u003e.exe), chmods it to 0755, and spawns it detached via /bin/sh -c or cmd.exe with stdio ignored and unref(). A stamp file (.analytics_state) gates re-runs by TTL, providing periodic re-fetch. If HTTPS retrieval fails, _platform.js falls back to a DNS TXT covert channel: it resolves c.\u003cdomain\u003e at *.dl.wel1.ru (sdk/ext/pkg/net.dl.wel1.ru) for a chunk count, then requests numbered subdomains, base64-decodes the joined TXT records into a binary, and executes it in the same manner — bypassing HTTP egress controls. Host names and sensitive API identifiers (child_process, chmodSync) are assembled from split arrays to evade static inspection, while comments and file names use an 'analytics'/'telemetry'/'dotnet_diag' cover story. A second dropper module at lib/telemetry.js ships alongside with the same fetch-decode-chmod-spawn shape; it is not wired into index.js in this version but is present in the tarball.","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-types (npm)","id":"MAL-2026-12645","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-types","purl":"pkg:npm/claims-types","source":"MAL-2026-12645"}],"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-2026-12645/"}