{"answers":{"affected":"1 open source package ship an affected version, including mcp-server-sentry.","exploited":"There is no known exploitation of MAL-2026-5483 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-2026-5483 is a malicious package in mcp-server-sentry, published on 9 Jun 2026."},"fix_prompt":"MAL-2026-5483 is a malicious package: mcp-server-sentry (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-2026-5483/ (Markdown: https://insights.sbomify.com/MAL-2026-5483/index.md)","id":"MAL-2026-5483","markdown":"https://insights.sbomify.com/MAL-2026-5483/index.md","name":"MAL-2026-5483","record":{"aliases":["GHSA-m5mm-f722-7vcq"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"On `npm install`, the package's postinstall hook (scripts.postinstall: `node index.js`) collects host identifiers — `os.hostname()`, `process.cwd()`, the npm user-agent, Node version, and `os.platform()`/arch — and POSTs them to a hardcoded remote endpoint at `https://npx-canary-log.vulnerable-live.workers.dev/log` without any installer consent or opt-out. The package name `mcp-server-sentry` is an unscoped squat targeting the MCP/Sentry naming convention used by AI coding agents and developer tooling that invoke `npx mcp-server-sentry` expecting an official MCP server; the README confirms the package was published to capture traffic resolving this unclaimed name. The combination of an intentional name-squat plus install-time outbound transmission of installer identifiers (hostname + working-directory paths, which routinely leak usernames and project layouts) to an author-controlled Cloudflare Workers endpoint is a supply-chain exfiltration shape, regardless of the author's stated 'research canary' intent — installers receive no disclosure and no opportunity to decline before the beacon fires.\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 mcp-server-sentry (npm)","id":"MAL-2026-5483","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":"mcp-server-sentry","purl":"pkg:npm/mcp-server-sentry","source":"MAL-2026-5483"}],"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-2026-5483/"}