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Fencer Vulns
medium 6.5

CVE-2026-47204 json

Envoy: grpc_stats filter segfault on Connect protocol requests to direct_response routes

published 2026-06-26 4 mo ago modified 2026-10-25 14 d ago also BIT-envoy-2026-47204 , EUVD-2026-39824 , GHSA-3jxh-8p6x-7pf6

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.26.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, the envoy.filters.http.grpc_stats filter crashes (null pointer dereference / segfault) when a Connect protocol request (Content-Type: application/connect+proto or application/connect+json) hits a direct_response route. A single unauthenticated HTTP request crashes the Envoy process. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.

Patch / fix

  • bitnami envoy 1.35.13, 1.36.9, 1.37.5, 1.38.3
  • envoyproxy envoy 1.35.13, 1.36.9, 1.37.5, 1.38.3
  • istioctl openSUSE Tumbleweed 1.30.2-1.1

opensuse advisories openSUSE-SU-2026:11141-1

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-2026-47204 updated cvss 6.5

envoy: Envoy: Denial of Service via Connect protocol request

  • Red Hat OpenShift Service Mesh 2 openshift-service-mesh/proxyv2-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift Service Mesh 3.0 openshift-service-mesh/istio-proxyv2-rhel9 1784908682
    fixed: vendor fix RHSA-2026:49705
  • Red Hat OpenShift Service Mesh 3.1 openshift-service-mesh/istio-proxyv2-rhel9 1784953556
    fixed: vendor fix RHSA-2026:49729
  • Red Hat OpenShift Service Mesh 3.2 openshift-service-mesh/istio-proxyv2-rhel9 1784953743
    fixed: vendor fix RHSA-2026:49744
  • Red Hat OpenShift Service Mesh 3.3 openshift-service-mesh/istio-proxyv2-rhel9 1784908639
    fixed: vendor fix RHSA-2026:49765
  • Red Hat OpenShift Service Mesh 3.0 openshift-service-mesh/istio-cni-rhel9 1784885742, openshift-service-mesh/istio-pilot-rhel9 1784885559, openshift-service-mesh/istio-rhel9-operator 1784917979, openshift-service-mesh/istio-must-gather-rhel9 1784796256, openshift-service-mesh/istio-sail-operator-bundle 1784921382, openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9 1784886243 Red Hat OpenShift Service Mesh 3.1 openshift-service-mesh/istio-cni-rhel9 1784885281, openshift-service-mesh/istio-pilot-rhel9 1784885133, openshift-service-mesh/istio-rhel9-operator 1784918113, openshift-service-mesh/istio-must-gather-rhel9 1784797072, openshift-service-mesh/istio-sail-operator-bundle 1785036397, openshift-service-mesh-tech-preview/istio-ztunnel-rhel9 1784870048 Red Hat OpenShift Service Mesh 3.2 openshift-service-mesh/istio-cni-rhel9 1784921753, openshift-service-mesh/istio-pilot-rhel9 1784921772, openshift-service-mesh/istio-ztunnel-rhel9 1784922382, openshift-service-mesh/istio-rhel9-operator 1784918117, openshift-service-mesh/istio-must-gather-rhel9 1784839815, openshift-service-mesh/istio-sail-operator-bundle 1785036373 Red Hat OpenShift Service Mesh 3.3 openshift-service-mesh/istio-cni-rhel9 1784885810, openshift-service-mesh/istio-pilot-rhel9 1784885681, openshift-service-mesh/istio-ztunnel-rhel9 1784886337, openshift-service-mesh/istio-rhel9-operator 1785316150, openshift-service-mesh/istio-must-gather-rhel9 1784885505, openshift-service-mesh/istio-sail-operator-bundle 1785322241
    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
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/envoyproxy/envoy/security/advisories/GHSA-3jxh-8p6x-7pf6 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 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
bitnami envoy
>=1.26.0, <1.35.13
>=1.36.0, <1.36.9
>=1.37.0, <1.37.5
>=1.38.0, <1.38.3
1.35.13
1.36.9
1.37.5
1.38.3

Affected products

  • envoyproxy envoy

Classification

Weakness

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.