{"answers":{"affected":"1 open source package ship an affected version, including eth-library-toolkit.","exploited":"There is no known exploitation of MAL-2026-13720 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-2026-13720 is a malicious package in eth-library-toolkit, published on 10 Aug 2026."},"fix_prompt":"MAL-2026-13720 is a malicious package: eth-library-toolkit (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-2026-13720/ (Markdown: https://insights.sbomify.com/MAL-2026-13720/index.md)","id":"MAL-2026-13720","markdown":"https://insights.sbomify.com/MAL-2026-13720/index.md","name":"MAL-2026-13720","record":{"aliases":["GHSA-mqxc-259c-25w3"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"eth-library-toolkit@2.1.3 presents itself as @ethereumjs/util — README, badges, and the repository URL point at the ethereumjs/ethereumjs-monorepo — but is published under an unaffiliated npm account (azeura \u003cazeura@gmail.com\u003e). The package's dist/index.js unconditionally executes require(\"commonjs-assertion\") at load time, and package.json declares \"commonjs-assertion\": \"^1.2.7\" as a runtime dependency in place of the upstream ethjs-util dependency used by the real @ethereumjs/util. commonjs-assertion is not an ethereumjs project and has no functional relationship to the utility APIs this package advertises. Any consumer that installs and requires eth-library-toolkit will resolve and execute whatever code commonjs-assertion currently ships, giving the substituted package arbitrary code execution inside the installer's Node.js process. The impersonation shell plus forced third-party dependency load matches the lookalike-clone-as-delivery-vehicle supply-chain pattern.\n\nAny computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.","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 eth-library-toolkit (npm)","id":"MAL-2026-13720","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":["0"],"last_affected":[],"package":"eth-library-toolkit","purl":"pkg:npm/eth-library-toolkit","source":"MAL-2026-13720"}],"products":null,"published":"2026-08-10","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-2026-13720/"}