{"answers":{"affected":"1 open source package ship an affected version, including api-nebula.","exploited":"There is no known exploitation of MAL-2026-17531 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-2026-17531 is a malicious package in api-nebula, published on 5 Oct 2026."},"fix_prompt":"MAL-2026-17531 is a malicious package: api-nebula (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-2026-17531/ (Markdown: https://insights.sbomify.com/MAL-2026-17531/index.md)","id":"MAL-2026-17531","markdown":"https://insights.sbomify.com/MAL-2026-17531/index.md","name":"MAL-2026-17531","record":{"aliases":["GHSA-q4h6-37pw-8pc9"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"The package declares `\"preinstall\": \"node preinstall.cjs\"` in package.json, and preinstall.cjs is a single-line ~187 KB `Function(\"pbeIUC\", \"…\")` invocation implementing a custom PRNG plus string-table decoder (numeric constant table, printable-charset string table `UclPgF`, a Bob-Jenkins-style mixer, and a decoder that reconstructs strings via modular arithmetic against `UclPgF.charCodeAt(...)`). The file contains no readable logic — its entire payload is an opaque blob that is decoded and handed to the JS engine during `npm install`. String fragments visible pre-decoding (e.g. `F.kI`, `zehSPTc@y.Ge`, `vCpP.BB/.i+gUAKa`) are placeholder-shaped and only resolve to real hosts/commands after runtime decoding, so the actual install-time behavior and any network destinations are hidden from static inspection. The wrapper module (nebula.js) and package.json declare no native build step, no compilation, and no other legitimate reason for a 187 KB obfuscated preinstall script. This is the canonical obfuscated npm preinstall dropper shape: arbitrary attacker-authored code executes on every installer's machine at `npm install` time, with intent to evade review deliberately concealed by the string-table + Function-eval loader.\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 api-nebula (npm)","id":"MAL-2026-17531","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":"api-nebula","purl":"pkg:npm/api-nebula","source":"MAL-2026-17531"}],"products":null,"published":"2026-10-05","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-2026-17531/"}