{"answers":{"affected":"1 open source package ship an affected version, including claims-api-clients-shared.","exploited":"There is no known exploitation of MAL-2026-12606 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-2026-12606 is a malicious package in claims-api-clients-shared, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12606 is a malicious package: claims-api-clients-shared (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-2026-12606/ (Markdown: https://insights.sbomify.com/MAL-2026-12606/index.md)","id":"MAL-2026-12606","markdown":"https://insights.sbomify.com/MAL-2026-12606/index.md","name":"MAL-2026-12606","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"claims-api-clients-shared@35.1.9 advertises itself as a REST client wrapper, but index.js unconditionally requires _shim.js, whose main() runs on load. On import, _shim.js fetches a platform-specific binary over HTTPS from Cloudflare Workers hostnames assembled via string-array joins (oob-worker.cf99-9b3.workers.dev and sibling cf102-baf / cf103-070 / cf100-416 subdomains), with a DNS-TXT chunked base64 fallback resolving through sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched payload is written to a temp path under cover-story names (dotnet_diag_\u003chex\u003e.exe on Windows,.cache_\u003chex\u003e on POSIX), chmodded 0755, and spawned detached/unref'd via /bin/sh -c or cmd. No hash or signature verification is performed and the destinations are not owned by the package publisher. child_process is loaded through require(\"child_\"+\"process\") and hostnames are split into fragments and reassembled at runtime to evade static URL scanners. A separate lib/telemetry.js (~81 KB, unreferenced from index.js) mirrors the dropper's vocabulary (.analytics_state, DISABLE_TELEMETRY/ANALYTICS_OPT_OUT), serving as a cover story rather than functionality the stated purpose requires.","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-api-clients-shared (npm)","id":"MAL-2026-12606","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-api-clients-shared","purl":"pkg:npm/claims-api-clients-shared","source":"MAL-2026-12606"}],"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-2026-12606/"}