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Alpine Linux Docker CVE-2026-92542

| EUVDEUVD-2026-94483 MEDIUM
Authentication Bypass by Spoofing (CWE-290)
N/A vendor:alpine
6.9
CVSS 4.0 · Vendor: vendor:alpine
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Access Docker-enabled Alpine host
  2. Exploit
    Interact with vulnerable Docker component
  3. Execution
    Trigger undisclosed flaw
  4. Impact
    Undetermined impact

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Anti-spoofing controls
MITRE ATT&CK

1 technique across 1 tactic: Defense Evasion

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Cannot be determined from available data - the advisory only states that Docker is 'fixed in 29.8.2-r0' on Alpine Linux and provides no attack vector, privilege, or configuration detail. The one concrete prerequisite that can be stated is environmental: the target must be an Alpine Linux host running the Docker package at a revision earlier than 29.8.2-r0. Whether exploitation requires local access to the host, interaction with the Docker daemon/socket, a malicious image or container, specific daemon configuration, or authentication is NOT specified in the input and must be obtained from the upstream Docker/Moby CVE and the Alpine security database before defenders can assess realistic exposure.

Impact

This entry provides almost no technical signal to assess real-world risk. The only data present is an Alpine Linux advisory-style string ('docker fixed in 29.8.2-r0') and a reporter of 'vendor:alpine' - there is no CVSS score, no CVSS vector, no CWE, and no description of the vulnerability class, attack vector, or impact. As a result, none of the standard prioritization signals can be evaluated: attack vector, complexity, and privilege requirements are all unknown; there is no EPSS probability provided; KEV status is not indicated (treat as not listed); no POC is referenced; and no SSVC exploitation/automatable/technical-impact values are available. Exploitation status is therefore 'no public exploit identified at time of analysis.' The one meaningful risk amplifier is prevalence: Docker Engine is ubiquitously deployed across development, CI/CD, and production container hosts, so ANY genuine Docker Engine vulnerability has a very large attack surface. However, with the actual flaw undescribed it is impossible to distinguish a high-priority container-escape/privilege-escalation issue from a low-severity local or informational bug. This must be treated as an incomplete record: the affected component (Docker, as packaged by Alpine) and the fixed version (29.8.2-r0) are the only confirmed facts, and a vendor advisory (Alpine secdb / the upstream Moby/Docker CVE) should be consulted before any prioritization decision.

Exploit ScenarioDerived

No exploit scenario can be responsibly constructed because the vulnerability class, attack vector, and impact are not described in the available data. In general terms, an attacker or malicious container/image would interact with the Docker daemon on an Alpine host running a version prior to 29.8.2-r0, but the specific trigger and outcome are unknown. No POC is referenced in the input.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 30, 2026

Docker on Alpine Linux is affected by CVE-2026-92542, which the Alpine maintainers addressed by releasing Docker package revision 29.8.2-r0, superseding all earlier revisions of the package in the Alpine repositories. The advisory is a package-level fix notification only: it carries no CVSS score, no CWE mapping, no attack vector, and no privilege or configuration detail, so the precise defect and its exploitation prerequisites cannot be established from this data alone. The only firm, verifiable exposure condition is environmental - an Alpine Linux host running the Docker package at a revision below 29.8.2-r0. No public exploit code and no confirmed active exploitation (CISA KEV) have been identified at time of analysis, and no EPSS score was supplied.

RemediationAI

Vendor-released patch: 29.8.2-r0 - upgrade the Alpine Docker package to 29.8.2-r0 or later, for example with 'apk update && apk upgrade docker' (or 'apk add --upgrade docker' to force the newer revision), then verify with 'apk version -l "<"' that no docker subpackages remain below the fixed revision and rebuild any container images whose base layer pinned an older docker package. Because the advisory discloses no attack vector, treat the window before upgrade as unquantified rather than low risk, and prioritise hosts that run the Docker daemon with elevated exposure. Compensating controls, with their trade-offs: restrict access to /var/run/docker.sock (remove untrusted users from the docker group, keep the socket mode at 0660 and root-owned) - this breaks Docker access for non-privileged CI runners, monitoring agents, and developer tooling that rely on group membership; never expose dockerd over plaintext TCP (avoid -H tcp://0.0.0.0:2375) and if remote API access is required enable mutual TLS on port 2376 - this adds certificate issuance and rotation overhead and can break existing clients; stop mounting the Docker socket into containers, since socket-mounted containers are effectively root on the host - this may break watchtower-style agents, log collectors, and build-in-container workflows; and enable the Docker userns-remap or rootless mode for workloads where compatible - this can break images expecting real root inside the container and complicates volume permission handling. Until the Alpine secdb and upstream Moby advisory are reviewed, do not assume the fix is confined to production workloads; also patch build hosts and CI runners, which frequently run older, unmanaged Docker packages. Advisory tracking: the Alpine Linux security database entry for CVE-2026-92542, and the linked upstream Docker/Moby security advisory, should be used to confirm whether additional configuration changes or image rebuilds are required.

Affected VersionsENISA

Docker Engine 0 <25.0.19
Docker Engine overlay network driver 0 <v25.0.19
Docker Engine overlay network driver v26.0.0 <*
Docker Engine 26.0.0 <29.8.2
Moby overlay network driver v2.0.0-beta.0 <v2.0.0-beta.25

Affected Packages

euvd docker_engine fix: 25.0.19, 29.8.2

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This entry originates from the Alpine Linux vendor advisory stream rather than from an upstream Moby/Docker advisory, which means the technical root cause is not described in the supplied data and no CWE class can be assigned. Alpine packages track upstream Moby/Docker releases and append a distribution revision suffix (-r0, -r1, and so on) for packaging changes; the fixed identifier 29.8.2-r0 therefore indicates either an upstream Docker release 29.8.2 absorbed into Alpine or a coordinated Alpine rebuild carrying the upstream fix. Because no CPE strings, CVSS vector, or component-level detail were provided, it is impossible to tell whether the underlying issue sits in the Docker daemon (dockerd), the CLI, containerd/runc components, or Alpine's packaging and build scripts for the docker aport. This matters for scoping: the Docker daemon typically runs as root and has direct control over host networking, filesystems, cgroups, and namespaces, so a defect in that layer can escalate well beyond the container boundary, whereas a CLI or packaging defect may be far narrower. Analysts should correlate CVE-2026-92542 with the upstream Moby security advisory and the Alpine secdb entry (security.alpinelinux.org) to recover the vector, CWE, and affected subpackages before drawing conclusions about blast radius.

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Severity by source

Vendor (vendor:alpine) PRIMARY 6.9 MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (vendor:alpine) · only source for this CVE.

CVSS VectorVendor: vendor:alpine

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

Lifecycle Timeline

3
Patch available
Oct 07, 2026 - 18:02 EUVD
CVSS changed
Oct 07, 2026 - 17:22 NVD
6.9 (MEDIUM)
CVE Published
Sep 30, 2026 - 22:10 cve.org
MEDIUM

DescriptionCVE.org

Alpine Linux: docker fixed in 29.8.2-r0

Threat Intelligence Overview

EPSS Score
0.1%
Top 100% exploitable
Prevalence
Ubiquitous
Docker Engine is a de facto standard container runtime across dev, CI, and production
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 MEDIUM
CISA KEV No
Public POC No
EPSS 0.1%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
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
Scheduled
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
High

Priority Score

34
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +34
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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