Tar extraction in moby/go-archive can write outside the destination directory via link following (CVE-2026-17106)

What is affected, what to do

A flaw was found in moby/go-archive. The tar extraction routines in the component do not properly restrict filesystem operations to the intended destination directory.

An exploit is publicly available. Update Moby Go-archive to version 0.3.0, Docker Sandboxes to version 0.38.0, Docker Desktop to version 4.86.0.

Affected

• Moby Go-archive lt *..0.3.0
• Docker Sandboxes lt *..0.38.0
• Docker Desktop lt *..4.86.0
• Docker Engine lt *..29.7.0
• Docker CLI lt *..29.7.0
• Docker Compose lt *..5.4.0

Fixed in

• Moby Go-archive 0.3.0
• Docker Sandboxes 0.38.0
• Docker Desktop 4.86.0
• Docker Engine 29.7.0
• Docker CLI 29.7.0
• Docker Compose 5.4.0

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2

NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

Read in glossary

High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.

CRA

The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

Read in glossary

From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.

ISO/IEC 27001

ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

Read in glossary

Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

A flaw was found in moby/go-archive. The tar extraction routines in the component do not properly restrict filesystem operations to the intended destination directory. An attacker who controls the contents of an archive can exploit this by including symbolic links, allowing them to create or overwrite files at arbitrary locations on the system where the archive is being extracted. This could lead to unauthorized modification of system files or potentially arbitrary code execution.

Source: redhat_csaf, BSI WID Portal, BSI CSAF, OSV (Open Source Vulnerabilities), suse_csaf, NVD (NIST), cvelistv5, GitHub Security Advisories, Microsoft Security Update Guide

Vendors and products

• Docker Docker Desktop
• Docker Docker Engine
• Docker Docker Sandboxes
• Go
• Moby
• Open Source Docker

Weakness classes (CWE)

• CWE-59Improper Link Resolution Before File Access ('Link Following')

  Base

  The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

  Entry at MITRE CWE-59

References & sources

• github.commoby/go-archive/security/advisories/GHSA-hfg8-hc9c-6c3hVendor advisory
• docs.docker.comdesktop/release-notesRelease notes
• github.comdocker/sbx-releases/releases/tag/v0.38.0Release notes
• docs.docker.comengine/release-notes/29Release notes
• github.comdocker/cli/releases/tag/v29.7.0Release notes
• github.comdocker/compose/releases/tag/v5.4.0Release notes
• github.commoby/go-archive/releases/tag/v0.3.0Patch
• github.commasasron/CopyEscape-CVE-2026-17106Exploit
• github.commoby/moby/issues/52948web
• github.combikini/exploitarium/tree/main/docker-cp-copyout-destination-esc…web
• github.commoby/go-archivepackage
• github.commoby/moby/releases/tag/docker-v29.7.0web
• imperva.comblog/copyescape-taking-over-docker-hosts-with-docker-cpweb
• NVD (NIST)vuln/detail/CVE-2026-17106web

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

1. 19.08.2026Record modifiedCISA ADP

   CISA assessment (SSVC): exploitation: proof of concept, automatable: no

   Show the original change

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   SSVC assessment	changed	{"id":"CVE-2026-17106","role":"CISA Coordinator","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-08-18T18:50:49.774785Z"}	{"id":"CVE-2026-17106","role":"CISA Coordinator","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-08-18T00:00:00+00:00"}

   Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0