CVE-2026-17106
Tar extraction in moby/go-archive can write outside the destination directory via link following
- State
- Published
- Severity
- 7.1 High
- Published
- Aug 18, 2026
- Updated
- Aug 19, 2026
- Reserved
- Jul 24, 2026
Description
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. 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 links introduced by the archive can be followed out of the destination directory. An attacker who controls the contents of an archive can create or overwrite files at arbitrary paths writable by the extracting process.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | Docker |
Weaknesses
- CWE-59 Improper Link Resolution Before File Access ('Link Following')
Affected Products
| Product | Versions |
|---|---|
go-archivemoby |
|
Docker SandboxesDocker |
|
Docker DesktopDocker |
|
Docker EngineDocker |
|
Docker CLIDocker |
|
Docker ComposeDocker |
|
References
- https://github.com/moby/go-archive/security/advisories/GHSA-hfg8-hc9c-6c3hvendor-advisory
- https://docs.docker.com/desktop/release-notes/#4860release-notes
- https://github.com/docker/sbx-releases/releases/tag/v0.38.0release-notes
- https://docs.docker.com/engine/release-notes/29/#2970release-notes
- https://github.com/docker/cli/releases/tag/v29.7.0release-notes
- https://github.com/docker/compose/releases/tag/v5.4.0release-notes
- https://github.com/moby/go-archive/releases/tag/v0.3.0patch
- https://github.com/masasron/CopyEscape-CVE-2026-17106exploit
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