{"answers":{"affected":"1 open source package ship an affected version, including http-uploader-dev.","exploited":"There is no known exploitation of MAL-2026-4580 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-2026-4580 is a malicious package in http-uploader-dev, published on 21 May 2026."},"fix_prompt":"MAL-2026-4580 is a malicious package: http-uploader-dev (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-2026-4580/ (Markdown: https://insights.sbomify.com/MAL-2026-4580/index.md)","id":"MAL-2026-4580","markdown":"https://insights.sbomify.com/MAL-2026-4580/index.md","name":"MAL-2026-4580","record":{"aliases":["GHSA-4cmw-88qw-qcpr"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"package.json declares `\"preinstall\": \"bun run index.js\"`, which on `npm install` invokes Bun to run index.js. index.js detects the host OS and shells out to launch an unrelated local application — `open -a Calculator` on macOS, `calc.exe` on Windows, and `xcalc`/`gnome-calculator`/`kcalc` on Linux — via `execSync`. This is the canonical proof-of-concept install-time RCE payload and bears no relation to the package's stated 'http uploader' purpose. Two independently suspicious structural traits compound the lifecycle behavior: (1) the preinstall hook routes execution through Bun, an alternate runtime fetched outside the normal Node resolution path, matching the alternate-runtime-dropper pattern; (2) package metadata is placeholder/throwaway (author 'sleep', homepage `https://git.hfaf.com/urlaa`, generic name 'http-uploader-dev'). The PoC nature of the current payload (launching a calculator) does not lower the severity: any installer running `npm install http-uploader-dev` executes attacker-chosen commands at install time, and a future republish can swap in arbitrary code with no change to the trigger surface.\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 http-uploader-dev (npm)","id":"MAL-2026-4580","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":"http-uploader-dev","purl":"pkg:npm/http-uploader-dev","source":"MAL-2026-4580"}],"products":null,"published":"2026-05-21","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-2026-4580/"}