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Docker EUVDEUVD-2026-79951

| 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
8.7
CVSS 4.0 · Vendor: docker
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Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V15 - Secure Coding and Architecture TOCTOU prevention
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 15, 2026

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. Vendor-released fix: Docker Sandboxes 0.41.0; no public exploit code or CISA KEV entry was identified at time of analysis.

Affected VersionsENISA

Docker Sandboxes 0.37.0 <0.41.0

Affected Packages

euvd docker_sandboxes fix: 0.41.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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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

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

CVSS VectorVendor: docker

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Vulnerable system: Confidentiality
High
Vulnerable system: Integrity
High
Vulnerable system: Availability
None
Subsequent system: Confidentiality
High
Subsequent system: Integrity
High
Subsequent system: Availability
None

Lifecycle Timeline

2
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.

Executive ViewAI

Why It Matters

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 its authorized workspace, potentially exposing sensitive data or host-level capabilities. Any team relying on Docker Sandboxes for developer isolation or for containing untrusted workloads should treat this as a boundary-integrity issue, because the sandbox is the control that keeps guest activity away from host resources. A vendor fix is available in 0.41.0, and no public exploit code was identified at time of analysis, so exposure is manageable through prompt version upgrade.

Recommended Action

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.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.1%
Top 99% exploitable
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.1%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact
High

Priority Score

44
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +44
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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