# MAL-2026-15921: Malicious code in box-sign-client-poc (npm) - **Type:** Malicious package - **Package:** `box-sign-client-poc` (npm) - **Published:** 4 Sep 2026 ## What is MAL-2026-15921? MAL-2026-15921 is a malicious package in box-sign-client-poc, published on 4 Sep 2026. ### Official description package.json declares a preinstall hook that runs index.js on `npm install`. The script reads the installer's hostname and OS username, embeds them together with a timestamp into a DNS subdomain of the form `poc---.iv6mfybhp42k33ysmzi73de5w.canarytokens.com`, and issues a DNS resolution for that name, causing the installer's host and user identifiers to be transmitted to a third-party canarytokens.com collector at install time. The package name and framing indicate a dependency-confusion proof-of-concept targeting a Box-branded internal package, but the exfiltration primitive runs against any machine that installs it. ## What should I do about MAL-2026-15921? Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed. ## Fix prompt for AI coding agents ```text MAL-2026-15921 is a malicious package: box-sign-client-poc (npm). Every version was published to cause harm. Task: 1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies. 2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for. 3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated. 4. If the package is not used anywhere, say so and change nothing. Reference: https://insights.sbomify.com/MAL-2026-15921/ (Markdown: https://insights.sbomify.com/MAL-2026-15921/index.md) ``` ## Sources - OSV: https://osv.dev/vulnerability/MAL-2026-15921 --- From sbomify Insights: https://insights.sbomify.com/MAL-2026-15921/ Summaries are generated and may contain mistakes; the official description above is the record.