CVE-2026-102282 — adm-zip extraction preserves SUID/SGID bits from untrusted ZIPs -> local privilege escalation

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
cthackers / adm-zip	affected < 0.6.1

CWE

CWE-732

References

ADP enrichment

CISA-ADP

No English description supplied.

https://github.com/cthackers/adm-zip/security/advisories/GHSA-j5f4-cc29-5x44