CopyEscape: Container-to-host arbitrary file write via docker cp (CVE-2026-17106)
CopyEscape: Container-to-host arbitrary file write via docker cp (CVE-2026-17106) Source: https://www.imperva.com/blog/copyescape-taking-over-docker-hosts-with-docker-cp/
CopyEscape: Container-to-host arbitrary file write via docker cp (CVE-2026-17106)
Description
CopyEscape: Container-to-host arbitrary file write via docker cp (CVE-2026-17106) Source: https://www.imperva.com/blog/copyescape-taking-over-docker-hosts-with-docker-cp/
Reddit Discussion
https://www.imperva.com/blog/copyescape-taking-over-docker-hosts-with-docker-cp/
Author here. I discovered a vulnerability in docker cp that allows a malicious container to create or overwrite files on the machine running the Docker CLI.
The exploit combines a filesystem race in Docker’s archive creation with unsafe symlink handling during extraction. Depending on the CLI user’s privileges, this can lead to code execution. Docker confirmed that sbx cp was also affected.
Fixed versions:
- Docker Engine/CLI 29.7.2+
- Docker Desktop 4.86.0+
- Docker Sandboxes 0.38.0+
Happy to answer technical questions.
Links cited in this discussion
Technical Details
- Source Type
- Subreddit
- cybersecurity
- Reddit Score
- 0
- Discussion Level
- minimal
- Content Source
- reddit_link_post
- Post Type
- link
- Domain
- null
- Newsworthiness Assessment
- {"score":45,"reasons":["external_link","newsworthy_keywords:cve-","security_identifier","established_author","very_recent"],"isNewsworthy":true,"foundNewsworthy":["cve-"],"foundNonNewsworthy":[]}
- Has External Source
- true
- Trusted Domain
- false
Threat ID: 6a7b4614bf8831d539fda2db
Added to database: 08/11/2026, 15:56:04 UTC
Last updated: 08/11/2026, 15:56:04 UTC
Views: 1
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