@xhmikosr/decompress: Path traversal via symlink chain — GHSA-HRH2-VP3X-79XF

Summary

### Impact When extracting an untrusted archive with the default `decompress(input, output)` API, a crafted archive containing a chain of symlink entries can make a later entry resolve **outside** the output directory. The lexical containment checks pass, but the kernel follows the planted symlinks to a path outside `output`, letting an attacker write (and read) files outside the intended extraction directory.…

Timeline

Published by source

2026-09-29

Risk context

• Reported severity or threat level: critical.
• Reported CVSS score: 9.1 out of 10.
• Review exposure for the affected product or family: npm: @xhmikosr/decompress | npm: decompress.

Product

npm: @xhmikosr/decompress | npm: decompress

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-HRH2-VP3X-79XF

Source

GitHub

Vendor

GitHub

Published by source

2026-09-29

Last source activity

2026-09-29

Additional identifiers

CVE-2026-101894

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.