moby/go-archive: Crafted tar archive can write outside the extraction directory
### 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 filesystem operation on a path that is resolved by the OS, so a links introduced by the archive can be followed out of the destination directory. ### Impact An attacker who controls the contents of archive can create or overwrite files at arbitrary paths writable by the extracting process. ### Workarounds Only extract trusted archives.
beschreibt (1)
Zugehörige CVEs.
| ID | Schweregrad | ausnutzbar | ||
|---|---|---|---|---|
| CVE-2026-17106US | — | Exploit | ||
The tar extraction routines in moby/go-archive (Unpack, UnpackLayer, Untar/UntarUncompressed, and the ApplyLayer helpers) do not confine filesystem operations to the destination di… | ||||
Referenzen
Externe Belege — Patches, Meldungen, Analysen.
- https://docs.docker.com/desktop/release-notes/#4860WEB
- https://github.com/bikini/exploitarium/tree/main/docker-cp-copyout-destination-escapeWEB
- https://github.com/docker/cli/releases/tag/v29.7.0WEB
- https://github.com/moby/go-archivePACKAGE
- https://github.com/moby/go-archive/security/advisories/GHSA-hfg8-hc9c-6c3hWEB
- https://github.com/moby/moby/issues/52948WEB
- https://github.com/moby/moby/releases/tag/docker-v29.7.0WEB
- https://www.imperva.com/blog/copyescape-taking-over-docker-hosts-with-docker-cpWEB
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