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Fencer Vulns
medium 5.0

CVE-2026-34165 json

go-git: Maliciously crafted idx file can cause asymmetric memory consumption

published 2026-03-30 7 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-17449 , GHSA-jhf3-xxhw-2wpp , GO-2026-4910

cvss
5.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

go-git is an extensible git implementation library written in pure Go. From version 5.0.0 to before version 5.17.1, a vulnerability has been identified in which a maliciously crafted .idx file can cause asymmetric memory consumption, potentially exhausting available memory and resulting in a denial-of-service (DoS) condition. Exploitation requires write access to the local repository's .git directory, it order to create or alter existing .idx files. This issue has been patched in version 5.17.1.

Patch / fix

  • go github.com/go-git/go-git/v5 5.17.1
  • go-git_project go-git 5.17.1
  • golang-github-go-git-go-git Debian 14 5.17.1-1

debian advisories DEBIAN-CVE-2026-34165

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • teleport openSUSE Tumbleweed 17.7.23-1.1
  • steampipe openSUSE Tumbleweed 2.4.1-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:10684-1openSUSE-SU-2026:10509-1

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-2026-34165 updated cvss 5.0

github.com/go-git/go-git/v5: go-git: Denial of Service via crafted .idx file

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 assisted/agent-preinstall-image-builder-rhel9 Red Hat Builds for Red Hat OpenShift openshift-builds/openshift-builds-waiters-rhel9, openshift-builds/openshift-builds-webhook-rhel9, openshift-builds/openshift-builds-controller-rhel9, openshift-builds/openshift-builds-git-cloner-rhel9, openshift-builds/openshift-builds-image-bundler-rhel9, openshift-builds/openshift-builds-image-processing-rhel9 Red Hat Confidential Compute Attestation openshift-sandboxed-containers/osc-must-gather-rhel9 Red Hat External Secrets Operator for Red Hat OpenShift external-secrets-operator/external-secrets-rhel9, external-secrets-operator/bitwarden-sdk-server-rhel9, external-secrets-operator/external-secrets-operator-rhel9, external-secrets-operator/external-secrets-operator-bundle Red Hat Kernel Module Management Operator for Red Hat Openshift kmm/kernel-module-management-must-gather-rhel9 Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/cluster-logging-rhel9-operator
    +34 more products
    Red Hat Logical Volume Manager Storage lvms4/lvms-must-gather-rhel9 Red Hat Machine Deletion Remediation Operator workload-availability/machine-deletion-remediation-rhel9-operator, workload-availability/machine-deletion-remediation-operator-bundle Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-log-reader-rhel8, rhmtc/openshift-migration-must-gather-rhel8 Red Hat Migration Toolkit for Virtualization mtv-candidate/mtv-must-gather-rhel8, migration-toolkit-virtualization/mtv-must-gather-rhel8 Red Hat Multicluster Engine for Kubernetes multicluster-engine/must-gather-rhel9 Red Hat Network Observability Operator network-observability/network-observability-cli-rhel9 Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-must-gather-rhel9 Red Hat OpenShift API for Data Protection oadp/oadp-mustgather-rhel9 Red Hat OpenShift Developer Tools and Services ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9, ocp-tools-4/jenkins-agent-base-rhel8, ocp-tools-4/jenkins-agent-base-rhel9 Red Hat OpenShift Pipelines openshift-pipelines/pipelines-resolvers-rhel8 Red Hat OpenShift Serverless openshift-serverless-clients, openshift-serverless-1/kn-client-kn-rhel9, openshift-serverless-1/serverless-must-gather-rhel9, openshift-serverless-1/kn-plugin-func-func-util-rhel9 Red Hat OpenShift Service Mesh 2 openshift-service-mesh/istio-must-gather-rhel9 Red Hat OpenShift Service Mesh 3 openshift-service-mesh/istio-must-gather-rhel9 Red Hat Pen Drive Powered by Red Hat Lightspeed pen-drive/pen-drive-scanner-rhel9 Red Hat Power monitoring for Red Hat OpenShift openshift-power-monitoring/power-monitoring-rhel9-operator Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-must-gather-rhel9, rhacm2/submariner-rhel9-operator, rhacm2/submariner-operator-bundle, rhacm2/multicluster-operators-subscription-rhel9 Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8, advanced-cluster-security/rhacs-roxctl-rhel8, advanced-cluster-security/rhacs-scanner-rhel8, advanced-cluster-security/rhacs-rhel8-operator, advanced-cluster-security/rhacs-scanner-v4-rhel8, advanced-cluster-security/rhacs-scanner-slim-rhel8 Red Hat AI Inference Server rhaiis/vllm-cpu-rhel9, rhaiis/vllm-tpu-rhel9, rhaiis/vllm-cuda-rhel9, rhaiis/vllm-rocm-rhel9 Red Hat Ansible Automation Platform 2 ansible-automation-platform-24/aap-must-gather-rhel8, ansible-automation-platform-25/aap-must-gather-rhel8, ansible-automation-platform-26/aap-must-gather-rhel9 Red Hat Build of Kueue kueue/kueue-must-gather-rhel9 Red Hat Edge Manager 1 flightctl, rhem/flightctl-api-rhel9, rhem/flightctl-worker-rhel9, rhem/flightctl-db-setup-rhel9, rhem/flightctl-periodic-rhel9, rhem/flightctl-pam-issuer-rhel9, +5 more Red Hat Enterprise Linux 8 grafana, grafana-loki, grafana-mssql, grafana-mysql, grafana-selinux, grafana-graphite, +8 more Red Hat Enterprise Linux 9 grafana, grafana-selinux 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 Red Hat OpenShift AI (RHOAI) rhoai/odh-cli-rhel9, rhoai/rhai-cli-rhel9, rhoai/odh-must-gather-rhel9, rhoai/odh-pipeline-runtime-minimal-cpu-py312-rhel9, rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9, rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9, +19 more Red Hat OpenShift Container Platform 4 cri-o, openshift, openshift-clients, openshift-kubelet, openshift-hyperkube, openshift4/ose-console, +48 more Red Hat Openshift Data Foundation 4 odf4/mcg-core-rhel9, odf4/odf-must-gather-rhel9, odf4/odf-cloudnative-pg-rhel9-operator Red Hat OpenShift Dev Workspaces Operator devworkspace/devworkspace-rhel9-operator, devworkspace/devworkspace-operator-bundle, devworkspace/devworkspace-project-clone-rhel9 Red Hat OpenShift for Windows Containers openshift4-wincw/windows-machine-config-rhel9-operator, openshift4-wincw/windows-machine-config-operator-bundle Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9, openshift-gitops-1/gitops-rhel8, openshift-gitops-1/must-gather-rhel8, openshift-gitops-1/argocd-agent-rhel8, openshift-gitops-1/gitops-rhel8-operator, +1 more Red Hat OpenShift Virtualization 4 container-native-virtualization/cluster-network-addons-operator, container-native-virtualization/cluster-network-addons-operator-rhel9 Red Hat OpenStack Platform 16.2 rhosp-rhel8/osp-director-agent, rhosp-rhel8/osp-director-operator, rhosp-rhel8/osp-director-operator-bundle Red Hat OpenStack Platform 17.1 rhosp-rhel9/osp-director-agent, rhosp-rhel9/osp-director-operator, rhosp-rhel9/osp-director-operator-bundle Red Hat OpenStack Platform 18.0 rhoso-operators/openstack-operator-bundle
    affected: workaround, no fix available “Fix deferred”

1 more 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
7 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.0 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
GitHub 3.1 5.0 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go github.com/go-git/go-git/v5
>=5.0.0, <5.17.1
5.17.1
go github.com/go-git/go-git
all versions
 no fix listed
go github.com/go-git/go-git/v4
all versions
 no fix listed

Affected products

  • go-git go-git

Classification

Weakness
  • CWE-191 Integer Underflow (Wrap or Wraparound)
  • CWE-770 Allocation of Resources Without Limits or Throttling

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.

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