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Fencer Vulns
medium 5.8

CVE-2026-22772 json

Fulcio vulnerable to Server-Side Request Forgery (SSRF) via MetaIssuer Regex Bypass

published 2026-01-12 9 mo ago modified 2026-09-10 1 mo ago also GHSA-59jp-pj84-45mr , GO-2026-4311 , EUVD-2026-2001

cvss
5.8
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 14%
public exploits
0
none known

Summary

Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Prior to 1.8.5, Fulcio's metaRegex() function uses unanchored regex, allowing attackers to bypass MetaIssuer URL validation and trigger SSRF to arbitrary internal services. Since the SSRF only can trigger GET requests, the request cannot mutate state. The response from the GET request is not returned to the caller so data exfiltration is not possible. A malicious actor could attempt to probe an internal network through Blind SSRF. This vulnerability is fixed in 1.8.5.

Patch / fix

  • go github.com/sigstore/fulcio 1.8.5
  • linuxfoundation fulcio 1.8.5
  • golang-github-sigstore-fulcio Debian 14 1.8.5-1

debian advisories DEBIAN-CVE-2026-22772

  • cosign SLES for SAP applications 16.0, SLES 16.0 3.0.5-160000.1.1
  • cosign SLE Module for Basesystem 15 SP7, openSUSE Leap 15.6 3.0.5-150400.3.35.1
  • vexctl openSUSE Leap 15.6 0.4.1+git78.f951e3a-150000.1.11.1
  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20260123T022811-150000.1.140.1

suse advisories SUSE-SU-2026:20904-1SUSE-SU-2026:0777-1SUSE-SU-2026:0592-1SUSE-SU-2026:0292-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • vexctl openSUSE Leap 16.0 0.4.4+git20.5d61136-160000.1.1
  • cosign openSUSE Leap 16.0 3.0.5-160000.1.1
  • cosign openSUSE Tumbleweed 3.0.5-1.1
  • vexctl openSUSE Tumbleweed 0.4.1+git78.f951e3a-1.1
  • hauler openSUSE Leap 16.0 1.4.1-bp160.1.1
  • hauler openSUSE Tumbleweed 1.4.1-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:21481-1openSUSE-SU-2026:20386-1openSUSE-SU-2026:10235-1openSUSE-SU-2026:10230-1openSUSE-RU-2026:20161-1

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-2026-22772 updated cvss 5.8

fulcio: Fulcio: Server-Side Request Forgery (SSRF) via unanchored regex in MetaIssuer URL validation

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-controller-rhel9, assisted/agent-preinstall-image-builder-rhel9 Red Hat Compliance Operator compliance/openshift-compliance-must-gather-rhel8 Red Hat Confidential Compute Attestation openshift-sandboxed-containers/osc-must-gather-rhel9, openshift-sandboxed-containers/osc-podvm-builder-rhel9 Red Hat File Integrity Operator compliance/openshift-compliance-must-gather-rhel8 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
    +23 more products
    Red Hat Logical Volume Manager Storage lvms4/lvms-must-gather-rhel9 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 Red Hat Multiarch Tuning Operator multiarch-tuning/multiarch-tuning-rhel9-operator, multiarch-tuning/multiarch-tuning-operator-bundle 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 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, 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-service-api-rhel9, openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9 Red Hat OpenShift Pipelines openshift-pipelines-client, openshift-pipelines/pipelines-opc-rhel9, openshift-pipelines/pipelines-cli-tkn-rhel8, openshift-pipelines/pipelines-cli-tkn-rhel9, openshift-pipelines/pipelines-rhel8-operator, openshift-pipelines/pipelines-rhel9-operator, +7 more Red Hat OpenShift Serverless openshift-serverless-1/kn-plugin-event-sender-rhel9, openshift-serverless-1/serverless-must-gather-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 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 Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8, 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-26/platform-resource-runner-rhel9, ansible-automation-platform-tech-preview/ansible-devspaces-rhel9 Red Hat Build of Kueue kueue/kueue-must-gather-rhel9 Red Hat Build of Podman Desktop - Tech Preview rhdesktop/rh-podman-desktop-ext-rhel-rhel10, rhdesktop/rh-podman-desktop-ext-bootc-rhel10 Red Hat Certification Program for Red Hat Enterprise Linux 9 rhcertification/redhat-certification-baremetal Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9 Red Hat Enterprise Linux 8 podman, skopeo, buildah, podman-tests, skopeo-tests, buildah-tests, +11 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 9 podman, skopeo, buildah, ubi9/skopeo, podman-tests, rhel9/skopeo, +18 more
    affected: workaround, no fix available, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 10 podman, skopeo, buildah, ubi10/podman, ubi10/skopeo, image-builder, +9 more Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-aws-cuda-rhel9, rhelai3/bootc-gcp-cuda-rhel9, rhelai3/bootc-azure-cuda-rhel9 Red Hat OpenShift AI (RHOAI) rhoai/odh-must-gather-rhel9, rhoai/odh-llama-stack-core-rhel9, rhoai/odh-ml-pipelines-runtime-generic-rhel9, rhoai/odh-model-registry-job-async-upload-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 cri-o, podman, skopeo, podman-tests, skopeo-tests, podman-docker, +47 more 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
    +4 more products
    Red Hat OpenStack Platform 18.0 rhoso-operators/openstack-must-gather-rhel9, rhoso-operators/prometheus-podman-exporter-rhel9 Red Hat Quay 3 quay/quay-rhel9, quay/quay-builder-rhel8, quay/quay-builder-rhel9 Red Hat Web Terminal web-terminal/web-terminal-tooling-rhel9 Red Hat Security Profiles Operator compliance/openshift-security-profiles-rhel8-operator, compliance/openshift-security-profiles-operator-bundle
    affected: workaround, no fix available “Fix deferred”

3 more fixed, 3 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
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/sigstore/fulcio/security/advisories/GHSA-59jp-pj84-45mr referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
GitHub 3.1 5.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
go github.com/sigstore/fulcio
<1.8.5
1.8.5

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.