CVE-2026-78122 PUBLISHED

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.

• nedlir reporter

• GitHub Issue #182
• https://github.com/Tecnativa/docker-socket-proxy
• https://github.com/Tecnativa/docker-socket-proxy/blob/v0.5.0/haproxy.cfg#L49-L61
• https://github.com/Tecnativa/docker-socket-proxy/pull/183
• https://gist.github.com/nedlir/e4f52f88a757f02c67db1fd5dd70d732
• VulnCheck Advisory: docker-socket-proxy through 0.5.0 Insufficient Access Control Granularity Exposes Container Filesystems

• Insufficient Granularity of Access Control CWE