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Fencer Vulns
high 8.7

CVE-2026-49478 json

Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage

published 2026-06-30 4 mo ago modified 2026-10-24 15 d ago also EUVD-2026-57859 , GHSA-f5mr-q85p-6hh6 , GO-2026-5853

cvss
8.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits
0
none known

Summary

Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Versions through 1.8.5 improperly follow cross-host redirects and attach Kubernetes ServiceAccount tokens during OIDC discovery, allowing a malicious or compromised issuer to perform blind SSRF, substitute and cache malicious JWKS keys, or disclose ServiceAccount tokens to external hosts. Version 1.8.6 blocks cross-host redirects, restricts token injection, and restricts local token loading. No known workarounds are available.

Patch / fix

  • go github.com/sigstore/fulcio 1.8.6
  • linuxfoundation fulcio 1.8.6
  • golang-github-sigstore-fulcio Debian 14 1.8.7-1

debian advisories DEBIAN-CVE-2026-49478

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

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-2026-49478 updated cvss 6.5

github.com/sigstore/fulcio: Fulcio: Server-Side Request Forgery and Kubernetes ServiceAccount token leakage

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 assisted/agent-preinstall-image-builder-rhel9 Red Hat Confidential Compute Attestation openshift-sandboxed-containers/osc-must-gather-rhel9 Red Hat Kernel Module Management Operator for Red Hat Openshift kmm/kernel-module-management-must-gather-rhel9 Red Hat Lightspeed Core lightspeed-core/rag-tool-cpu-rhel9, lightspeed-core/rag-tool-cuda-12.9-rhel9 Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/cluster-logging-rhel9-operator Red Hat Logical Volume Manager Storage lvms4/lvms-must-gather-rhel9
    +3 more products
    Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-controller-rhel8, 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, migration-toolkit-virtualization/mtv-must-gather-rhel9 Red Hat Multiarch Tuning Operator multiarch-tuning/multiarch-tuning-rhel9-operator, multiarch-tuning/multiarch-tuning-operator-bundle
    affected: workaround, no fix available “Upgrade to Fulcio v1.8.6 or later. No workaround is available.”
  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/must-gather-rhel9, multicluster-engine/assisted-service-8-rhel8, multicluster-engine/assisted-service-9-rhel9, multicluster-engine/assisted-installer-controller-rhel8, multicluster-engine/assisted-installer-controller-rhel9
    affected: workaround, no fix available, no fix planned “Upgrade to Fulcio v1.8.6 or later. No workaround is available.”
  • Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-must-gather-rhel9 Red Hat OpenShift API for Data Protection oadp/oadp-mustgather-rhel9, oadp/oadp-velero-plugin-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 Lightspeed openshift-lightspeed/lightspeed-agentic-sandbox-rhel9 Red Hat OpenShift Pipelines openshift-pipelines/pipelines-opc-rhel9, openshift-pipelines/pipelines-cli-tkn-rhel8, openshift-pipelines/pipelines-cli-tkn-rhel9, openshift-pipelines/pipelines-chains-controller-rhel8, openshift-pipelines/pipelines-chains-controller-rhel9 Red Hat OpenShift Serverless openshift-serverless-1/kn-plugin-event-sender-rhel9, openshift-serverless-1/serverless-must-gather-rhel9
    +20 more products
    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 Security 4 advanced-cluster-security/rhacs-roxctl-rhel8, advanced-cluster-security/rhacs-rhel8-operator, advanced-cluster-security/rhacs-scanner-v4-rhel8 Red Hat Ansible Automation Platform 2 ansible-automation-platform-26/hub-rhel9, ansible-automation-platform-26/ee-supported-rhel9, ansible-automation-platform-25/aap-must-gather-rhel8, ansible-automation-platform-26/aap-must-gather-rhel9, ansible-automation-platform-27/aap-must-gather-rhel9, ansible-automation-platform-26/platform-resource-runner-rhel9, +1 more Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9, rhdh/rhdh-must-gather-rhel9 Red Hat Enterprise Linux 9 ubi9/skopeo, ubi9/buildah, rhel9/rhel-bootc, rhel9-eus/rhel-9.6-bootc, rhel9-eus/rhel-9.8-bootc, rhel9/bootc-image-builder, +1 more Red Hat Enterprise Linux 10 ubi10/podman, ubi10/skopeo, ubi10/buildah, rhel10/rhel-bootc, podman 6.0.0-1.el10, skopeo 1.23.0-1.el10, +5 more Red Hat OpenShift AI (RHOAI) rhoai/rhai-cli-rhel9, rhoai/odh-must-gather-rhel9, rhoai/odh-th06-cpu-torch291-py312-rhel9, rhoai/odh-th06-cuda130-torch291-py312-rhel9, rhoai/odh-pipeline-runtime-minimal-cpu-py312-rhel9, rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9, +16 more Red Hat OpenShift Container Platform 4 openshift4/ose-cli, openshift4/ose-tests, openshift-kni/commatrix, openshift4/ose-deployer, openshift4/ose-cli-rhel9, openshift4/cnf-tests-rhel8, +37 more Red Hat OpenShift Container Platform 5 openshift-kni/commatrix, openshift5/ose-cli-rhel9, openshift5/cnf-tests-rhel9, openshift5/ose-tests-rhel9, openshift5/ose-tools-rhel9, openshift5/ose-deployer-rhel9, +20 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 Spaces devspaces/udi-rhel9, devspaces/udi-base-rhel9, devspaces/udi-base-rhel10 Red Hat OpenShift GitOps openshift-gitops-1/must-gather-rhel8, openshift-gitops-1/must-gather-rhel9 Red Hat OpenShift Virtualization 4 container-native-virtualization/cnv-must-gather-rhel9, container-native-virtualization/ocp-virt-validation-checkup-rhel9 Red Hat OpenStack Platform 18.0 rhoso-operators/openstack-operator-bundle, rhoso-operators/prometheus-podman-exporter-rhel9 Red Hat Quay 3 quay/quay-builder-rhel8, quay/quay-builder-rhel9 Red Hat Trusted Artifact Signer fulcio, rhtas/ec-rhel9, rhtas/cosign-rhel9, rhtas/fulcio-rhel9, rhtas/gitsign-rhel9 Red Hat Security Profiles Operator compliance/openshift-security-profiles-rhel8-operator, compliance/openshift-security-profiles-operator-bundle Red Hat Self-service automation portal 2 ansible-automation-platform/bootc-automation-portal-rhel9
    affected: workaround, no fix available “Upgrade to Fulcio v1.8.6 or later. No workaround is available.”
  • Red Hat Advanced Cluster Security 4.9 advanced-cluster-security/rhacs-main-rhel8 1785413210
    fixed: vendor fix “Upgrade to Fulcio v1.8.6 or later. No workaround is available.” RHSA-2026:48872
  • Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10 advanced-cluster-security/rhacs-main-rhel8 1785420959
    fixed: vendor fix “Upgrade to Fulcio v1.8.6 or later. No workaround is available.” RHSA-2026:48913
  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 fulcio Red Hat Confidential Compute Attestation fulcio
    not affected: vulnerable code not present

37 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
total
Assessed
2 mo ago

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
GitHub 3.1 8.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/sigstore/fulcio
<1.8.6
1.8.6

Affected products

  • sigstore fulcio

Classification

Weakness
  • CWE-918 Server-Side Request Forgery

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.