Which versions of Docker are affected by EUVD-2026-79951?

Docker Sandboxes versions 0.37.0 through 0.40.x contain a high-severity race condition (CVSS 8.7) that can allow code running inside a sandboxed guest to reach host-side Unix-domain sockets outside…. A patch is available.

How to fix or mitigate EUVD-2026-79951?

Within 24 hours, inventory all installations of Docker Sandboxes and confirm which endpoints, developer workstations, CI runners, or build hosts are running versions 0.37.0 through 0.40.x; treat any host that runs untrusted or third-party guest images on those versions as potentially exposed and restrict or pause such workloads where operationally feasible. Within 7 days, upgrade every affected installation to Docker Sandboxes 0.41.0 (the vendor-released fix) and verify the running version post-upgrade, prioritizing hosts with access to sensitive sockets, orchestration control planes, or production credentials, and rotate any credentials or tokens that were reachable from a host socket on a system known to have run untrusted guests. Within 30 days, validate the remediation through configuration and version audits, add Docker Sandboxes version currency to your standard patch-management reporting, and review whether untrusted guest workloads can be constrained to hosts with minimal host-socket exposure to limit the blast radius of any future relay-layer flaws.

Docker EUVD-2026-79951

Q: What is the CVSS score of EUVD-2026-79951?

EUVD-2026-79951 has a CVSS 4.0 base score of 8.7 (High). CVSS vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.1%.

| CVE-2026-79994 HIGH

Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367)

2026-09-15 security@docker.com

GHSA-wq46-97v9-q386

Information Disclosure Docker

8.7

CVSS 4.0 · Vendor: docker

Severity by source

Vendor (docker) PRIMARY

8.7 HIGH

CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (docker) · only source for this CVE.

CVSS VectorVendor: docker

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Analysis Generated

Sep 15, 2026 - 21:41 vuln.today

Patch available

Sep 15, 2026 - 21:20 EUVD

CVE Published

Sep 15, 2026 - 21:16 cve.org

HIGH 8.7

DescriptionCVE.org

The guest-to-host Unix-domain socket relay in Docker Sandboxes validates that a socket path is inside an authorized workspace, but later reconnects using the pathname. A malicious guest can replace an intermediate directory with a symlink between validation and connection, causing the host to connect to an arbitrary AF_UNIX socket outside the shared workspace. This can expose data or host-side capabilities provided by the targeted socket.

Articles & Coverage 1

News We need answer only title. Need generate concise article title for vendor vulnerability roundup. Format: "N New [Product] Vulnerabilities - X Critical, Y With POC". Product Docker. Total CVEs 4. Severity CRITICAL 2 HIGH 2. POC count 0. Need max 100 chars. Return only title no quotes. Need decide title. "4 New Docker Vulnerabilities - 2 Critical, 0 With POC" That matches format. Check chars: 4(1)+space1=2 New=3? Let's count: Sep 16, 2026

AnalysisAI

Docker Sandboxes 0.37.0 through 0.40.x contain a time-of-check/time-of-use race (CWE-367) in the guest-to-host Unix-domain socket relay: the host validates that a requested socket path sits inside an authorized workspace and then reconnects using that same pathname, letting a malicious guest swap an intermediate directory for a symlink in the gap. A guest that wins the race causes the host-side relay to connect to an arbitrary AF_UNIX socket outside the shared workspace, exposing whatever data or host capabilities that socket provides. …

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Recommended ActionAI

Within 24 hours, inventory all installations of Docker Sandboxes and confirm which endpoints, developer workstations, CI runners, or build hosts are running versions 0.37.0 through 0.40.x; treat any host that runs untrusted or third-party guest images on those versions as potentially exposed and restrict or pause such workloads where operationally feasible. …

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