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Fencer Vulns
medium 5.5

CVE-2026-61801 json

github.com/moby/sys/user has a possible DoS via unbounded parsing of user and group database files

published 2026-10-08 31 d ago modified 2026-10-19 20 d ago also GHSA-mjcv-p78q-w5fw , GO-2026-6686 , EUVD-2026-95094

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

The `github.com/moby/sys/user` package provides Go utilities for parsing and looking up entries in Unix-style user and group database files. Versions before 0.4.1 do not sufficiently limit entries when parsing `/etc/passwd`- or `/etc/group`-style files, allowing an attacker who can supply a specially crafted file to cause excessive memory consumption and potentially terminate the affected process due to an out-of-memory condition. This issue is patched in version 0.4.1. As a workaround, avoid parsing attacker-controlled user or group database files, or validate and limit untrusted input before parsing it.

Patch / fix

  • go github.com/moby/sys/user 0.4.1
  • golang-github-moby-sys Debian 14 0.0~git20260904.79376e0-1

debian advisories DEBIAN-CVE-2026-61801

  • grafana12.4 hummingbird 1 12.4.12-0.4.hum1
  • grafana13.1 hummingbird 1 13.1.7-0.1.hum1
  • grafana13.2 hummingbird 1 13.2.3-0.1.hum1

red hat advisories RHSA-2026:76677RHSA-2026:76448RHSA-2026:76430

  • google-osconfig-agent Linux Micro 6.0 20261015.00-159998.1.1

suse advisories SUSE-SU-2026:24374-1

  • buildpacks-cli openSUSE Tumbleweed 0.40.10-1.1
  • containerized-data-importer1.65 openSUSE Tumbleweed 1.65.0-4.1
  • google-osconfig-agent openSUSE Tumbleweed 20261015.00-1.1

opensuse advisories openSUSE-SU-2026:12260-1openSUSE-SU-2026:12235-1openSUSE-SU-2026:12152-1

  • containerd2 Azure Linux 3.0 2.3.7-1
  • containerized-data-importer Azure Linux 3.0 1.62.0-9
  • docker-compose Azure Linux 3.0 2.27.0-16
  • kata-containers Azure Linux 3.0 4.1.0.kata1-2
  • kata-containers-cc Azure Linux 3.0 3.15.0.aks0-23
  • kubernetes Azure Linux 3.0 1.30.10-32
  • kubevirt Azure Linux 3.0 1.8.4-4
  • moby-engine Azure Linux 3.0 25.0.18-1

azure linux advisories AZL-107243AZL-107261AZL-107360AZL-107550AZL-107571AZL-107648

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-2026-61801 updated cvss 5.5

github.com/moby/sys/user: moby/sys/user: Denial of Service via crafted user or group database files

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-rhel9, rhai/assisted-installer-agent-rhel9, rhai/assisted-installer-controller-rhel9, assisted/agent-preinstall-image-builder-rhel9
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Compliance Operator compliance/openshift-compliance-must-gather-rhel8 Red Hat Confidential Compute Attestation build-of-trustee/trustee-must-gather-rhel9, openshift-sandboxed-containers/osc-monitor-rhel9, openshift-sandboxed-containers/osc-rhel9-operator, openshift-sandboxed-containers/osc-must-gather-rhel9, openshift-sandboxed-containers/osc-podvm-builder-rhel9, openshift-sandboxed-containers/osc-podvm-payload-rhel9, +1 more Red Hat Cryostat 4 cryostat/cryostat-storage-rhel9 Red Hat Custom Metric Autoscaler operator for Red Hat Openshift custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9-operator Red Hat DPU kit for NVIDIA dpu-kit-for-nvidia/must-gather-rhel10
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Exploit Intelligence exploit-intelligence/agent-client-rhel9, exploit-intelligence/vulnerability-analysis-rhel9
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Kernel Module Management Operator for Red Hat Openshift kmm/kernel-module-management-worker-rhel9, kmm/kernel-module-management-rhel9-operator, kmm/kernel-module-management-must-gather-rhel9, kmm/kernel-module-management-hub-rhel9-operator Red Hat Lightspeed Core lightspeed-core/rag-tool-cpu-rhel9, lightspeed-core/rag-tool-cuda-12.9-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/cluster-logging-rhel9-operator
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Logical Volume Manager Storage lvms4/lvms-must-gather-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Machine Deletion Remediation Operator workload-availability/machine-deletion-remediation-rhel9-operator, workload-availability/machine-deletion-remediation-operator-bundle
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-controller-rhel8
    affected: workaround, no fix available “Fix deferred”
show 8 more
  • Red Hat Migration Toolkit for Virtualization migration-toolkit-virtualization/mtv-must-gather-rhel9
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Multiarch Tuning Operator multiarch-tuning/multiarch-tuning-rhel9-operator, multiarch-tuning/multiarch-tuning-operator-bundle
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/must-gather-rhel9, multicluster-engine/assisted-installer-rhel8, multicluster-engine/assisted-installer-rhel9, multicluster-engine/assisted-service-8-rhel8, multicluster-engine/assisted-service-9-rhel9, multicluster-engine/hypershift-rhel9-operator, +4 more
    affected: workaround, no fix available, no fix planned “Out of support scope”
  • Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-agent-rhel9, multicluster-globalhub/multicluster-globalhub-grafana-rhel9, multicluster-globalhub/multicluster-globalhub-manager-rhel9, multicluster-globalhub/multicluster-globalhub-rhel9-operator Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-must-gather-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift API for Data Protection oadp/oadp-velero-plugin-rhel9 Red Hat OpenShift Developer Tools and Services ocp-tools-4/jenkins-rhel9, ocp-tools-4/jenkins-agent-base-rhel9
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-rhel9-operator, openshift-lightspeed/lightspeed-agentic-sandbox-rhel9, openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9 Red Hat OpenShift Serverless openshift-serverless-clients 1.17.0-4.el9, openshift-serverless-1/kn-plugin-func-func-util-rhel9 Red Hat OpenShift Service Mesh 3 openshift-service-mesh/istio-must-gather-rhel9 Red Hat OpenShift Source-to-Image (S2I) source-to-image/source-to-image-rhel8, source-to-image/source-to-image-rhel9 Red Hat Pen Drive Powered by Red Hat Lightspeed pen-drive/pen-drive-scanner-rhel9 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-grafana-rhel9, rhacm2/acm-must-gather-rhel9, rhacm2/submariner-rhel9-operator, rhacm2/multicloud-integrations-rhel9
    +6 more products
    Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8, advanced-cluster-security/rhacs-main-rhel9, advanced-cluster-security/rhacs-roxctl-rhel8, advanced-cluster-security/rhacs-roxctl-rhel9, advanced-cluster-security/rhacs-rhel8-operator, advanced-cluster-security/rhacs-rhel9-operator, +3 more Red Hat Ansible Automation Platform 2 ansible-automation-platform-26/hub-rhel9, ansible-automation-platform-27/hub-rhel9, ansible-automation-platform-26/ee-supported-rhel9, ansible-automation-platform-27/ee-supported-rhel9, ansible-automation-platform-26/aap-must-gather-rhel9, ansible-automation-platform-27/aap-must-gather-rhel9, +5 more Red Hat Build of Kueue kueue/kueue-must-gather-rhel9 Red Hat Build of Podman Desktop rh-podman-desktop 3c6fc75a2a6cf5bb9b8a667fddcbbf428132badc Red Hat Ceph Storage 7 rhceph/grafana-rhel9 Red Hat Ceph Storage 8 rhceph/grafana-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Ceph Storage 9 rhceph/alloy-rhel10, rhceph/grafana-rhel10
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Certification Program for Red Hat Enterprise Linux 9 rhcertification/redhat-certification-baremetal, rhcertification/redhat-certification-system-ai-10 Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9, rhdh/rhdh-must-gather-rhel9 Red Hat Edge Manager 1 flightctl 1.2.1-1.el9, rhem/flightctl-api-rhel9, rhem/flightctl-api-rhel10, rhem/flightctl-worker-rhel9, rhem/flightctl-worker-rhel10, rhem/flightctl-db-setup-rhel9, +19 more Red Hat Enterprise Linux 8 runc, podman, buildah, podman-tests, buildah-tests, podman-docker, +5 more Red Hat Enterprise Linux 9 runc, podman, skopeo, buildah, ubi9/skopeo, podman-tests, +25 more Red Hat Enterprise Linux 10 ubi10/podman, ubi10/skopeo, ubi10/buildah, rhel10/rhel-bootc, podman 6.1.0-2.el10, skopeo 1.24.0-2.el10, +9 more
    +1 more products
    Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-aws-cuda-rhel9, rhelai3/bootc-gcp-cuda-rhel9, rhelai3/bootc-azure-cuda-rhel9, rhelai3/bootc-azure-rocm-rhel9
    affected: workaround, no fix available “Fix deferred”

12 more affected, 1 more fixed, 1 more not affected in the full advisory

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
partial
Assessed
31 d ago

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go github.com/moby/sys/user
<0.4.1
0.4.1

Affected products

  • moby sys

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

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.