# CVE-2026-17106 — moby go-archive

> As of 2026-08-19, CVE-2026-17106 is a High-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in moby go-archive, CVSS v4.0 7.1, EPSS 0.4% (35.8th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-17106, most recently “Docker CopyEscape (CVE-2026-17106): docker cp / sbx cp flaw lets malicious containers overwrite host files”.

**Last updated:** 2026-08-19

## What is CVE-2026-17106?

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.

The record classifies CVE-2026-17106 under weakness class [CWE-59](https://cwe.mitre.org/data/definitions/59.html). 6 affected-product entries are recorded, across 2 vendors, listed below. The identifier was first published 44 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 7.1 — High (derived from score) (`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`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 35.8% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-18, last modified 2026-08-19

## Is CVE-2026-17106 being exploited?

Weaponised exploit code for CVE-2026-17106 is publicly available. 4 public proof-of-concept repositories are tracked for this identifier.

- [masasron/CopyEscape-CVE-2026-17106](https://github.com/masasron/CopyEscape-CVE-2026-17106) (github)
- [HackSpeak/CVE-2026-17106](https://github.com/HackSpeak/CVE-2026-17106) (github)
- [686f6c61/POC-CopyEscape-CVE-2026-17106](https://github.com/686f6c61/POC-CopyEscape-CVE-2026-17106) (github)
- [trickest/cve](https://github.com/trickest/cve/blob/main/2026/CVE-2026-17106.md) (trickest)

## Affected products and versions

- **moby**: go-archive
- **Docker**: Sandboxes, Desktop, Engine, CLI, Compose

## How to fix CVE-2026-17106

No vendor patch reference has been recorded for CVE-2026-17106 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-17106

1 tracked threat in the Threadlinqs corpus references CVE-2026-17106, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Docker CopyEscape (CVE-2026-17106): docker cp / sbx cp flaw lets malicious containers overwrite host files](https://intel.threadlinqs.com/threat/TL-2026-2812) — HIGH · 2026-09-30

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-09-30. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com — vendor advisory](https://github.com/moby/go-archive/security/advisories/GHSA-hfg8-hc9c-6c3h)
- [docs.docker.com — release notes](https://docs.docker.com/desktop/release-notes/#4860)
- [github.com — release notes](https://github.com/docker/sbx-releases/releases/tag/v0.38.0)
- [docs.docker.com — release notes (29)](https://docs.docker.com/engine/release-notes/29/#2970)
- [github.com — release notes (v29.7)](https://github.com/docker/cli/releases/tag/v29.7.0)

_Showing 5 of 7 recorded references._

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-17106
Full detection coverage and IOCs for threats exploiting CVE-2026-17106 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp