{"answers":{"affected":"1 open source package ship an affected version, including checkout-test-component.","exploited":"There is no known exploitation of MAL-2026-12595 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-2026-12595 is a malicious package in checkout-test-component, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12595 is a malicious package: checkout-test-component (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-2026-12595/ (Markdown: https://insights.sbomify.com/MAL-2026-12595/index.md)","id":"MAL-2026-12595","markdown":"https://insights.sbomify.com/MAL-2026-12595/index.md","name":"MAL-2026-12595","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./_runtime.js which unconditionally fetches a platform-specific executable from attacker-controlled Cloudflare Workers hosts (oob-worker.cf*.workers.dev) with a DNS/TXT fallback to *.dl.wel1.ru, writes it to /var/tmp or %TEMP% under cover-story names (.cache_\u003chex\u003e, dotnet_diag_\u003chex\u003e.exe, analytics_state), chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe. Destination hostnames are constructed by fragment-and-.join(\"\") to evade static analysis. A secondary dropper implementation is shipped as lib/telemetry.js (~81 KB) using base64 chunk decoding, cp.spawn(\"/bin/sh\", [\"-c\", filePath + \" \u0026\"]), and fs[\"chmod\"+\"Sync\"] with 0755, framed as an analytics.node SDK — duplicating the dropper mechanism as a dormant secondary payload. The package name resembles a benign test/checkout utility but contains no such functionality; its sole effect on load is to drop and execute attacker-controlled code on the installer's host.","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 checkout-test-component (npm)","id":"MAL-2026-12595","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":"checkout-test-component","purl":"pkg:npm/checkout-test-component","source":"MAL-2026-12595"}],"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-2026-12595/"}