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CVE-2026-78122: docker-socket-proxy fails to properly gate read endpoints in the /containers Docker API namespace when the CONTAINERS...

Published: August 22, 2026 | Last Modified: August 22, 2026

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.

Proof-of-Concept Exploits (1)

• Legendile7/CVE-2026-78122-POC

References

• gist.github.com/nedlir/e4f52f88a757f02c67db1fd5dd70d732
• github.com/Tecnativa/docker-socket-proxy
• github.com/Tecnativa/docker-socket-proxy/blob/v0.5.0/haproxy.cfg#L49-L61
• github.com/Tecnativa/docker-socket-proxy/issues/182
• github.com/Tecnativa/docker-socket-proxy/pull/183
• www.vulncheck.com/advisories/docker-socket-proxy-through-insufficient-access-con
• www.tenable.com/cve/CVE-2026-78122
• www.cnnvd.org.cn/home/globalSearch?keyword=CVE-2026-78122