CVE-2026-17106
An attacker who controls the contents of an archive can create or overwrite files at arbitrary paths writable by the extracting process.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.33%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 7.1 HIGHCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.33% probability · 25th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-59
- Source
- security@docker.com
References
- https://docs.docker.com/desktop/release-notes/#4860
- https://docs.docker.com/engine/release-notes/29/#2970
- https://github.com/docker/cli/releases/tag/v29.7.0
- https://github.com/docker/compose/releases/tag/v5.4.0
- https://github.com/docker/sbx-releases/releases/tag/v0.38.0
- https://github.com/moby/go-archive/releases/tag/v0.3.0
- https://github.com/moby/go-archive/security/advisories/GHSA-hfg8-hc9c-6c3h
- https://github.com/masasron/CopyEscape-CVE-2026-17106
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.