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Fencer Vulns
high 7.6

CVE-2026-92543 json

Docker Engine insecure-registry fallback via malicious DNS responses

published 2026-10-01 38 d ago modified 2026-10-08 31 d ago also EUVD-2026-94484 , GHSA-7cfq-22r6-qp73

cvss
7.6
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 0%
public exploits
0
none known

Summary

Docker Engine classifies a registry hostname as insecure using an any-match DNS check. loadInsecureRegistries() injects 127.0.0.0/8 and ::1/128 as insecure CIDRs by default. isCIDRMatch resolves all of the hostname's addresses and returns true if a single address is in the insecure CIDR list. Because the transport re-dials the hostname rather than the CIDR-matching address, a DNS answer set of one loopback IP plus a non-loopback attacker IP disables certificate verification and enables HTTP fallback for the registry connection.

Patch / fix

  • go github.com/moby/moby/v2 v2.0.0-beta.25
  • Docker Docker Engine 29.8.2
  • Moby Moby v2.0.0-beta.25
  • docker Alpine 3.24 29.8.2-r0

alpine advisories ALPINE-CVE-2026-92543

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • cert-manager Azure Linux 3.0 1.12.15-15
  • docker-buildx Azure Linux 3.0 0.14.0-19
  • docker-cli Azure Linux 3.0 25.0.7-6
  • docker-compose Azure Linux 3.0 2.27.0-16

azure linux advisories AZL-107195AZL-107315AZL-107333AZL-107351

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-92543 updated cvss 7.4

github.com/moby/moby: Docker Engine: Certificate verification bypass via flawed registry DNS check

  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/assisted-service-9-rhel9
    affected: no fix available
  • Red Hat Ceph Storage 5 rhceph/rhceph-5-dashboard-rhel8 Red Hat Ceph Storage 7 rhceph/grafana-rhel9 Red Hat Ceph Storage 9 rhceph/grafana-rhel10
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift Container Platform 4 openshift4/ose-console, openshift4/ose-agent-installer-api-server-rhel9
    affected: no fix available
  • Red Hat Multicluster Global Hub 1.7.4 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1793002792
    fixed: vendor fix RHSA-2026:95517
  • Red Hat Multicluster Global Hub 1.7.4 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1792971214, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1792971204, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1793057598, multicluster-globalhub/multicluster-globalhub-operator-bundle 1793081711, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9 1793057536 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-grafana-rhel9
    not affected: vulnerable code not present
  • Red Hat Enterprise Linux 9 grafana, grafana-selinux, grafana 12.4.3-2.el10 Red Hat Enterprise Linux 10 grafana 12.4.3-2.el10
    not affected: component not present
  • Red Hat OpenShift Container Platform 4 openshift4/ose-agent-installer-api-server-rhel8 Red Hat OpenShift Container Platform 5 openshift5/ose-agent-installer-api-server-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
32 d ago

Exploit prediction

0.09% chance of exploitation in the next 30 days, higher than 0% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 7.6 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CNA 4.0 7.6 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/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

Affected packages

ecosystem package affected fixed in
go github.com/moby/moby/v2
<v2.0.0-beta.25
v2.0.0-beta.25

Affected products

  • Docker Docker Engine
  • Moby Moby

Classification

Weakness
  • CWE-295 Improper Certificate Validation
  • CWE-319 Cleartext Transmission of Sensitive Information
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of moby/moby published their own advisory on GitHub. Reviewed sources take precedence over it.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.