{"answers":{"affected":"1 open source package ship an affected version, including claims-domain.","exploited":"There is no known exploitation of MAL-2026-12613 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-2026-12613 is a malicious package in claims-domain, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12613 is a malicious package: claims-domain (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-2026-12613/ (Markdown: https://insights.sbomify.com/MAL-2026-12613/index.md)","id":"MAL-2026-12613","markdown":"https://insights.sbomify.com/MAL-2026-12613/index.md","name":"MAL-2026-12613","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, `index.js` loads `_ext.js`, which reconstructs destination hostnames from string-split arrays (e.g. `[\"oob-worker.cf99-9b3\",\".wor\",\"kers.\",\"dev\"].join(\"\")`) to build URLs at `oob-worker.cf99-9b3.workers.dev`, `oob-worker.cf103-070.workers.dev`, and `oob-worker.cf102-baf.workers.dev`, with a DNS TXT fallback to `sdk.dl.wel1.ru`, `ext.dl.wel1.ru`, `pkg.dl.wel1.ru`, and `net.dl.wel1.ru`. The fetched platform-specific binary is written to `/var/tmp` or the Windows temp directory under disguised filenames (`.cache_\u003chex\u003e`, `dotnet_diag_\u003chex\u003e.exe`), chmodded to 0755, and spawned detached via `/bin/sh -c` or `cmd /c start`. The `child_process` module and `fs.chmodSync` API are also referenced through string concatenation (`require(\"child_\" + \"process\")`, `fs[\"chmod\" + \"Sync\"]`) alongside cover-story comments describing the routine as an analytics/telemetry SDK. The package's advertised purpose (a claims-domain library) does not require fetching or executing native binaries from anonymous Cloudflare Workers subdomains, and the delivery is unpinned, unhashed, and obfuscated.","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-domain (npm)","id":"MAL-2026-12613","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-domain","purl":"pkg:npm/claims-domain","source":"MAL-2026-12613"}],"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-2026-12613/"}