{"answers":{"affected":"1 open source package ship an affected version, including json-bigint-rs.","exploited":"There is no known exploitation of MAL-2026-17312 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-2026-17312 is a malicious package in json-bigint-rs, published on 30 Sep 2026."},"fix_prompt":"MAL-2026-17312 is a malicious package: json-bigint-rs (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-2026-17312/ (Markdown: https://insights.sbomify.com/MAL-2026-17312/index.md)","id":"MAL-2026-17312","markdown":"https://insights.sbomify.com/MAL-2026-17312/index.md","name":"MAL-2026-17312","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"On require(), index.js instantiates the shipped json-bigint-rs.wasm module and, for imports declared under the 'wasm:js/string-constants' module namespace, exposes each descriptor's name as an externref global. This mechanism smuggles a full JavaScript payload as WASM import-descriptor names, hiding it from JS-only source scanners. The reconstructed payload is an IIFE wired to node:vm.runInThisContext / runInNewContext that polls three hardcoded hosts (rs.undotest.top, rs.lightnight.top, rs.belivelight.top) every 30 seconds and executes the response body as JavaScript in-process with access to console and process. Execution is gated by NODE_ENV==='production', so the dropper stays dormant on developer machines and activates on servers and CI. The remote hosts are mutable and unrelated to any documented publisher; the behavior is undocumented in README. The package name and stated purpose (a bignum JSON parser) provide cover for a delivery vehicle whose only observable install/require-time effect is fetching and evaluating attacker-chosen JavaScript.","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 json-bigint-rs (npm)","id":"MAL-2026-17312","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":"json-bigint-rs","purl":"pkg:npm/json-bigint-rs","source":"MAL-2026-17312"}],"products":null,"published":"2026-09-30","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-2026-17312/"}