Skip to content
Fencer Vulns
high 8.8

CVE-2026-34040 json

Moby: AuthZ plugin bypass with oversized request body

published 2026-03-25 7 mo ago modified 2026-09-08 2 mo ago also EUVD-2026-17289 , GHSA-x744-4wpc-v9h2 , GO-2026-4887

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
9.3%
EPSS 9.3% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

Moby is an open source container framework. Prior to version 29.3.1, a security vulnerability has been detected that allows attackers to bypass authorization plugins (AuthZ). This issue has been patched in version 29.3.1.

Patch / fix

  • go github.com/moby/moby 29.3.1
  • go github.com/moby/moby/v2 2.0.0-beta.8
  • mobyproject moby 29.3.1
  • docker engine 29.3.1
  • docker.io Debian 13 26.1.5+dfsg1-9+deb13u1
  • docker.io Debian 14 28.5.2+dfsg4-2

debian advisories DEBIAN-CVE-2026-34040

  • docker-stable SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 24.0.9_ce-150000.1.45.1
  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20260402T184258-150000.1.158.1
  • docker-stable SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 24.0.9_ce-1.37.1

suse advisories SUSE-SU-2026:2579-1SUSE-SU-2026:2578-1SUSE-SU-2026:1205-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • docker-stable openSUSE Leap 16.0 24.0.9_ce-160000.6.1
  • docker-stable openSUSE Tumbleweed 24.0.9_ce-18.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:21205-1openSUSE-SU-2026:11075-1

  • docker Alpine 3.24, Alpine 3.23 29.3.1-r0

alpine advisories ALPINE-CVE-2026-34040

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

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-2026-34040 updated cvss 8.4

Moby: Moby: Authorization bypass vulnerability

  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/assisted-installer-rhel9, multicluster-engine/assisted-service-8-rhel8, multicluster-engine/assisted-service-9-rhel9, multicluster-engine/assisted-installer-agent-rhel9, multicluster-engine/assisted-installer-controller-rhel9 Red Hat Ceph Storage 5 rhceph-ci/grafana/grafana Red Hat OpenShift Container Platform 4 openshift3/ose-console
    affected: workaround, no fix available
  • Red Hat Multicluster Global Hub 1.4.9 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1779579439, multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1788375682
    fixed: vendor fix RHSA-2026:22347
  • Red Hat Multicluster Global Hub 1.5.8 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1778867753, multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1789515639
    fixed: vendor fix RHSA-2026:71597
  • Red Hat Multicluster Global Hub 1.6.6 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1780167118, multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1790086248
    fixed: vendor fix RHSA-2026:23345
  • Red Hat Multicluster Global Hub 1.7.3 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1779925273, multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1788376193
    fixed: vendor fix RHSA-2026:24503
  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/must-gather-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat Multicluster Global Hub 1.4.9 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1779838819, multicluster-globalhub/multicluster-globalhub-agent-rhel9 1788355439, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1779839447, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1788355599, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1779887217, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1788355417, +4 more Red Hat Multicluster Global Hub 1.5.8 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1779828691, multicluster-globalhub/multicluster-globalhub-agent-rhel9 1789515408, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1779828813, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1789515288, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1779828536, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1789478830, +4 more Red Hat Multicluster Global Hub 1.6.6 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1780320809, multicluster-globalhub/multicluster-globalhub-agent-rhel9 1790085494, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1780321673, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1790086176, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1779839087, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1790085268, +4 more Red Hat Multicluster Global Hub 1.7.3 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1780361828, multicluster-globalhub/multicluster-globalhub-agent-rhel9 1788377473, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1780615638, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1788377424, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1779887500, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1788372439, +4 more Red Hat OpenShift Service Mesh 2 openshift-service-mesh/istio-rhel8-operator
    not affected: vulnerable code not present
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/prometheus-rhel9, rhacm2/acm-grafana-rhel9, rhacm2/acm-must-gather-rhel9
    not affected: component not present
show 1 more
  • Red Hat OpenShift Container Platform 4 openshift4/ose-console, openshift4/ose-agent-installer-api-server-rhel8, openshift4/ose-agent-installer-api-server-rhel9 Red Hat OpenShift Virtualization 4 openshift-virtualization/hostpath-csi-driver-rhel9, openshift-virtualization/hostpath-provisioner-rhel9, openshift-virtualization/hostpath-provisioner-operator-rhel9, openshift-virtualization/hyperconverged-cluster-webhook-rhel9, openshift-virtualization/hyperconverged-cluster-operator-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
7 mo ago

Exploit prediction

9.27% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
GitHub 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go github.com/moby/moby
<29.3.1
all versions
29.3.1
go github.com/moby/moby/v2
<2.0.0-beta.8
2.0.0-beta.8
go github.com/docker/docker
all versions
 no fix listed

Affected products

  • moby moby

Classification

Weakness
  • CWE-288 Authentication Bypass Using an Alternate Path or Channel
  • CWE-863 Incorrect Authorization
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.