CVE-2026-78122 docker-socket-proxy through 0.5.0 Insufficient Access Control Granularity Exposes Container Filesystems
Attackers can read arbitrary files and download container filesystems via exposed Docker API endpoints when specific environment variables are set.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-78122?
CVE-2026-78122 is a high-severity missing authorization vulnerability in Tecnativa docker-socket-proxy, published on 22 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
docker-socket-proxy fails to properly gate read endpoints in the /containers Docker API namespace when the CONTAINERS environment variable is set. Attackers can use GET requests to /containers/{id}/archive, /containers/{id}/export, /containers/{id}/logs, and /containers/{id}/top to read arbitrary files and download entire container filesystems as tar archives.
Weakness: CWE-1220
Which versions are affected by CVE-2026-78122?
How do I fix CVE-2026-78122?
No fix has been published for CVE-2026-78122 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-78122 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78122 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-gxmj-gjp2-h2mv.