[ CVE-2026-102282 · Published 5 Oct 2026 ]
adm-zip extraction preserves SUID/SGID bits from untrusted ZIPs -> local privilege escalation
[ Why it matters ]Priority signals
- Public proof-of-concept exploit exists (CISA SSVC)
[ Description ]Official description
adm-zip is a JavaScript library for creating and extracting ZIP archives in Node.js. Prior to 0.6.1, adm-zip applies the Unix permission bits stored in a zip entry directly to the extracted file via `fs.chmodSync()` when `keepOriginalPermission=true` is passed to `extractAllTo()`/`extractEntryTo()` — and it never filters the setuid/setgid/sticky bits out of those bits. A zip crafted by an attacker can therefore produce an extracted binary with mode `04755`. When extraction runs as root (the default posture in Docker builds, CI runners, and privileged install steps — the exact environments where this flag is used), the resulting root-owned setuid file is executed later by a lesser-privileged user, turning the attacker's code into a root execution. Version 0.6.1 fixes the issue.
[ Fixes ]Fixes and patches
- adm-zip 0.6.1Fixed version · GitHub Advisories · npm package adm-zip: upgrade to 0.6.1 or later (affected <= 0.6.0)
[ Packages ]Affected open-source packages
- adm-zip npmAffected <= 0.6.0 · fixed in 0.6.1 · GHSA-j5f4-cc29-5x44