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Fencer Vulns
high 7.5

CVE-2025-47908 json

Denial of service via malicious preflight requests in github.com/rs/cors

published 2024-07-02 2 y ago modified 2026-09-10 1 mo ago also GHSA-mh55-gqvf-xfwm , GO-2024-2883 , EUVD-2025-23882

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

Middleware causes a prohibitive amount of heap allocations when processing malicious preflight requests that include a Access-Control-Request-Headers (ACRH) header whose value contains many commas. This behavior can be abused by attackers to produce undue load on the middleware/server as an attempt to cause a denial of service.

Patch / fix

  • go github.com/rs/cors 1.11.0
  • github.com/rs/cors github.com/rs/cors 1.11.0
  • golang-github-prometheus-alertmanager SLE Module for Package Hub 15 SP7, SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 +2 more 0.28.1-150100.4.28.2
  • rhnlib Manager Client Tools 12 5.0.6-21.55.1
  • grafana Manager Client Tools 12 11.5.10-1.87.1
  • mgr-push Manager Client Tools 12 5.0.3-1.30.3
  • spacecmd Manager Client Tools 12 5.0.14-38.162.1
  • uyuni-tools Manager Client Tools 12 0.1.37-1.27.1
  • golang-github-prometheus-alertmanager Manager Client Tools 12 0.28.1-1.34.1
  • supportutils-plugin-susemanager-client Manager Client Tools 12 5.0.5-6.36.1

suse advisories SUSE-SU-2025:4481-1SUSE-SU-2025:4457-1SUSE-SU-2025:3819-1SUSE-SU-2025:3817-1

  • golang-github-prometheus-alertmanager openSUSE Leap 16.0 0.28.1-bp160.1.1
  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20250807T150727-1.1

opensuse advisories openSUSE-SU-2026:21136-1openSUSE-SU-2025:15424-1

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-2025-47908 updated cvss 5.3

github.com/rs/cors: Denial of service via malicious preflight requests in github.com/rs/cors

  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/agent-service-rhel8, multicluster-engine/assisted-service-8-rhel8, multicluster-engine/assisted-service-9-rhel9, multicluster-engine/assisted-image-service-rhel8, multicluster-engine/assisted-image-service-rhel9 Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-grafana-rhel9 Red Hat OpenShift Serverless openshift-serverless-1/kn-plugin-event-sender-rhel8 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-grafana-rhel9, rhacm2/prometheus-alertmanager-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Ceph Storage 5 rhel9/grafana, rhceph/grafana-rhel9
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Ceph Storage 6 rhel9/grafana, rhceph/grafana-rhel9 Red Hat Ceph Storage 8 rhel9/grafana, rhceph/grafana-rhel9 Red Hat Enterprise Linux 9 grafana, rhel9/grafana, grafana-selinux Red Hat Enterprise Linux 10 grafana, rhel10/grafana Red Hat OpenShift Container Platform 4 openshift4/ose-prometheus-alertmanager, openshift4/ose-prometheus-alertmanager-rhel9, openshift4/ose-agent-installer-api-server-rhel8, openshift4/ose-agent-installer-api-server-rhel9 Red Hat OpenShift distributed tracing 3 rhosdt/opentelemetry-rhel8-operator, rhosdt/opentelemetry-collector-rhel8, rhosdt/opentelemetry-operator-bundle, rhosdt/opentelemetry-target-allocator-rhel8
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift GitOps openshift-gitops-1/dex-rhel8, openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9, openshift-gitops-1/gitops-rhel8, openshift-gitops-1/must-gather-rhel8, openshift-gitops-1/argo-rollouts-rhel8, +4 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 8 grafana, grafana-loki, grafana-mssql, grafana-mysql, rhel8/grafana, grafana-selinux, +9 more Red Hat Enterprise Linux 9 opentelemetry-collector Red Hat Enterprise Linux 10 opentelemetry-collector Red Hat OpenShift AI (RHOAI) rhoai/odh-rhel8-operator, rhoai/odh-rhel9-operator, rhoai/odh-dashboard-rhel8, rhoai/odh-modelmesh-rhel8, rhoai/odh-modelmesh-rhel9, rhoai/odh-mm-rest-proxy-rhel8, +40 more Red Hat OpenShift Dev Spaces devspaces/traefik-rhel9, devspaces/dashboard-rhel9, devspaces/configbump-rhel9, devspaces/imagepuller-rhel9, devspaces/devspaces-rhel9-operator, devspaces-tech-preview/jetbrains-ide-rhel9 Red Hat OpenShift distributed tracing 3 rhosdt/tempo-rhel8, rhosdt/tempo-query-rhel8, rhosdt/jaeger-agent-rhel8, rhosdt/jaeger-query-rhel8, rhosdt/tempo-gateway-rhel8, rhosdt/tempo-rhel8-operator, +10 more
    +2 more products
    Red Hat OpenShift Virtualization 4 container-native-virtualization/virt-cdi-cloner, container-native-virtualization/aaq-server-rhel9, container-native-virtualization/virt-cdi-importer, container-native-virtualization/virt-cdi-operator, container-native-virtualization/aaq-operator-rhel9, container-native-virtualization/mtq-operator-rhel9, +14 more Red Hat Trusted Artifact Signer rhtas/cosign-rhel9, rhtas/fulcio-rhel9, rhtas/rekor-cli-rhel9, rhtas/tuf-server-rhel9, rhtas/rekor-server-rhel9, rhtas/client-server-rhel9, +7 more
    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
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
15 mo ago

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go github.com/rs/cors
>=1.9.0, <1.11.0
1.11.0

Affected products

  • github.com/rs/cors github.com/rs/cors

Classification

Weakness
  • 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.