moby/go-archive: Crafted tar archive can write outside the extraction directory — GHSA-HFG8-HC9C-6C3H

Summary

### Summary The tar extraction routines in `moby/go-archive` (`Unpack`, `UnpackLayer`, `Untar`/`UntarUncompressed`, and the `ApplyLayer` helpers) do not confine filesystem operations to the destination directory. A crafted archive can create or overwrite files **outside** the intended destination. ### Details The extractor decides where each archive entry lands using lexical string checks and then performs the…

Timeline

Published by source

2026-08-18

Risk context

• Reported severity or threat level: high.
• Reported CVSS score: 7.1 out of 10.
• Review exposure for the affected product or family: go: github.com/moby/go-archive.

Product

go: github.com/moby/go-archive

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-HFG8-HC9C-6C3H

Source

GitHub

Vendor

GitHub

Published by source

2026-08-18

Last source activity

2026-08-18

Additional identifiers

CVE-2026-17106

Curated by

hlukh.ch

Related advisories and connections

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