CVE-2026-78122

Summary

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.

Affected Software

Weaknesses

• CWE-1220: Insufficient Granularity of Access Control

References

• https://github.com/Tecnativa/docker-socket-proxy/issues/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
• https://www.vulncheck.com/advisories/docker-socket-proxy-through-insufficient-access-control-granularity-exposes-container-filesystems

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