{"answers":{"affected":"1 open source package ship an affected version, including moustick.","exploited":"There is no known exploitation of MAL-2026-5347 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-2026-5347 is a malicious package in moustick, published on 9 Jun 2026."},"fix_prompt":"MAL-2026-5347 is a malicious package: moustick (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-2026-5347/ (Markdown: https://insights.sbomify.com/MAL-2026-5347/index.md)","id":"MAL-2026-5347","markdown":"https://insights.sbomify.com/MAL-2026-5347/index.md","name":"MAL-2026-5347","record":{"aliases":["GHSA-979m-vm48-369f"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"Package impersonates the popular `cookie-signature` library — it copies the description, README, author (TJ Holowaychuk), and repository URL of visionmedia/node-cookie-signature in package.json, while the package itself is published under the unrelated name `moustick`. On `require('moustick')`, index.js performs an HTTPS GET to https://www.jsonkeeper.com/b/MYUKZ (an anonymous, mutable paste host) and passes the response field `content_o` directly to `eval()`, executing whatever JavaScript the paste currently serves in the consumer's Node process. A helper function `g(h)` hex-decodes identifiers and assembles a second paste URL https://www.jsonkeeper.com/b/HY6M6 (`hl` decodes to ['axios','get','https://www.jsonkeeper.com/b/HY6M6','then']), providing a second remote-fetch primitive and confirming intentional evasion. Any developer who installs this package expecting cookie-signing functionality executes attacker-controlled code at import time; the operator can swap the paste contents at any time to deliver new payloads.\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 moustick (npm)","id":"MAL-2026-5347","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":"moustick","purl":"pkg:npm/moustick","source":"MAL-2026-5347"}],"products":null,"published":"2026-06-09","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-2026-5347/"}