{"answers":{"affected":"1 open source package ship an affected version, including zer0one-dnslog.","exploited":"There is no known exploitation of MAL-2026-5366 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-2026-5366 is a malicious package in zer0one-dnslog, published on 8 Jun 2026."},"fix_prompt":"MAL-2026-5366 is a malicious package: zer0one-dnslog (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-2026-5366/ (Markdown: https://insights.sbomify.com/MAL-2026-5366/index.md)","id":"MAL-2026-5366","markdown":"https://insights.sbomify.com/MAL-2026-5366/index.md","name":"MAL-2026-5366","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 is published as a 'simple date formatting utility' but ships a postinstall payload that, on `npm install`, runs a curl pipeline against cloud instance-metadata services to harvest temporary IAM credentials and internal SSRF data, then POSTs the collected output to an attacker-controlled out-of-band host. Specifically, postinstall.js issues curls to AWS metadata at 169.254.169.254 (IAM security-credentials path), Aliyun at 100.100.100.200, Tencent at metadata.tencentyun.com / 169.254.0.23, and Meituan-internal mtsrc-test.sankuai.com, writes the responses to /tmp/aws.txt, /tmp/ali.txt, /tmp/tx.txt, /tmp/tx2.txt, and uploads them via `curl -X POST` to https://h4mx6b7krgzarfehbutwabxbu20tojc8.oastify.com/metadata along with a listing of /data/. package.json declares `\"postinstall\": \"node postinstall.js\"`, so the harvest fires automatically on default install. On any cloud build host or CI runner this leaks role credentials with full AWS/Aliyun/Tencent access. The advertised purpose mismatches the shipped behavior (index.js is a one-line hello stub), confirming the package is a lure for credential theft, not a date utility.\n\nThe OpenSSF Package Analysis project identified 'zer0one-dnslog' @ 1.0.0 (npm) as malicious.\n\nIt is considered malicious because:\n\n- The package executes one or more commands associated with malicious behavior.","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 zer0one-dnslog (npm)","id":"MAL-2026-5366","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":"zer0one-dnslog","purl":"pkg:npm/zer0one-dnslog","source":"MAL-2026-5366"}],"products":null,"published":"2026-06-08","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-2026-5366/"}