# CVE-2026-78122 — Tecnativa docker-socket-proxy

> As of 2026-08-22, CVE-2026-78122 is a HIGH-severity vulnerability in Tecnativa docker-socket-proxy, CVSS v3.1 7.4, EPSS 0.3% (23.7th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-78122 as of 2026-08-22; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-22

## What is CVE-2026-78122?

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.

The record classifies CVE-2026-78122 under weakness class [CWE-1220](https://intel.threadlinqs.com/cwe/CWE-1220). Its CVSS v3 base vector states that the flaw is reachable from an adjacent network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 44 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.4 — HIGH (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N`)
- **CVSS v4.0 base score:** 8.3 (`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`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 23.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-22

## Is CVE-2026-78122 being exploited?

It currently carries a trending score of 36 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **Tecnativa**: docker-socket-proxy

## How to fix CVE-2026-78122

No vendor patch reference has been recorded for CVE-2026-78122 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-78122

No threat campaign in the Threadlinqs corpus currently references CVE-2026-78122, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-08-23. This product uses the NVD API but is not endorsed or certified by the NVD.

**Exploit and proof of concept**

- [gist.github.com — exploit](https://gist.github.com/nedlir/e4f52f88a757f02c67db1fd5dd70d732)

**Technical analysis**

- [github.com — technical description](https://github.com/Tecnativa/docker-socket-proxy/blob/v0.5.0/haproxy.cfg#L49-L61)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/docker-socket-proxy-through-insufficient-access-control-granularity-exposes-container-filesystems)

**Issue tracking and product pages**

- [github.com — issue tracking](https://github.com/Tecnativa/docker-socket-proxy/issues/182)
- [github.com — product](https://github.com/Tecnativa/docker-socket-proxy)
- [github.com — issue tracking (183)](https://github.com/Tecnativa/docker-socket-proxy/pull/183)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-78122
Full detection coverage and IOCs for threats exploiting CVE-2026-78122 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp