{"answers":{"affected":"1 open source package ship an affected version, including midcorp.","exploited":"There is no known exploitation of MAL-2026-4610 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-2026-4610 is a malicious package in midcorp, published on 22 May 2026."},"fix_prompt":"MAL-2026-4610 is a malicious package: midcorp (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-2026-4610/ (Markdown: https://insights.sbomify.com/MAL-2026-4610/index.md)","id":"MAL-2026-4610","markdown":"https://insights.sbomify.com/MAL-2026-4610/index.md","name":"MAL-2026-4610","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"The package masquerades as a pino-compatible logger (package.json keywords `fast`/`logger`/`stream`/`json`, exports `module.exports.pino = middleware`, lib filenames `proto.js`, `redaction.js`, `multistream.js`, `transport.js`, `worker.js` mirror pino's layout), but its actual runtime behavior is a remote-code-execution dropper. When a consumer requires midcorp and invokes the exported `middleware()` from `index.js`, a detached/unref'd child process spawns `lib/caller.js`, which performs `axios.get` against `https://jsonkeeper.com/b/XRGF3` (an anonymous, mutable paste-bin host) and passes the returned `data.cookie` field to `new Function.constructor('require', s)(require)` — handing attacker-controlled JavaScript full Node.js `require` capabilities. The C2 URL is obfuscated as a base64 string disguised as a fake `process.env.DEV_API_KEY` default in `lib/caller.js` / `lib/const.js` (`aHR0cHM6Ly9qc29ua2VlcGVyLmNvbS9iL1hSR0Yz` → `https://jsonkeeper.com/b/XRGF3`), with a backup paste ID (`4NAKK`). The description field is unrelated boilerplate about vulnerability management. Three independent block signals (remote-eval of paste-bin content, pino impersonation cover, base64-hidden C2) leave no benign interpretation.","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 midcorp (npm)","id":"MAL-2026-4610","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":"midcorp","purl":"pkg:npm/midcorp","source":"MAL-2026-4610"}],"products":null,"published":"2026-05-22","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-2026-4610/"}