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Vulnerability record · CVE-2026-17106 · published 18 August 2026

CVE-2026-17106: Link following vulnerability

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.

7.1 CVSS 4.0 High EPSS 0.44% · top 64.2% CWE-59 · Link following Awaiting Analysis
7.1CVSS 4.0 base score
0.44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
8References
28 Aug 2026Last modified by NVD

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/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-17106), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.