6.4

CVE-2026-53718: envoyproxy gateway Missing Authorization

CVSS: 6.4v3.1MediumAwaiting analysis
AliasesCGA-2f47-9pgc-f8vwCGA-2rcm-rmw7-wfpqCGA-3847-c2p7-9m7x
Published 14-09-2026Last modified 15-09-2026
Open JSON

Vulnerability summary

CVE-2026-53718 is a medium (CVSS 6.4) Missing Authorization vulnerability in envoyproxy gateway. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 34.1% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.41%
0%100%
Low · +0.09 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 2
OPENSUSE-SU-2026:21483-1CGA-Q38J-7GF7-JCHV

Timeline

  1. 14-09-2026
    PublishedVulnerability first disclosed.
  2. 15-09-2026
    Last modifiedVulnerability information updated.

Description

Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway. Prior to 1.7.4 and 1.8.1, an HTTPRoute can use an extension-managed custom backendRef to reference a backend resource in another namespace without a matching Gateway API ReferenceGrant in the target namespace. The custom-backend branch in internal/gatewayapi/route.go omits validateBackendNamespace, allowing the route-owning namespace to bind to and use the resource without the backend namespace owner's consent and violating the Gateway API cross-namespace authorization model. This issue is fixed in versions 1.7.4 and 1.8.1.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

+0.09 pp

From 0.33% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.41%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard37 products
  • datadog-agent-7.76< 7.76.3-r41
  • datadog-cluster-agent-7.73< 7.73.3-r23
  • datadog-cluster-agent-7.74< 7.74.1-r24
  • datadog-cluster-agent-7.75All versions (No fix recorded)
  • datadog-cluster-agent-7.76< 7.76.3-r32
Wolfi11 products
  • datadog-agent-7.76< 7.76.3-r41
  • datadog-cluster-agent-7.73< 7.73.3-r23
  • datadog-cluster-agent-7.75All versions (No fix recorded)
  • datadog-cluster-agent-7.76< 7.76.3-r32
  • datadog-cluster-agent-7.77< 7.77.3-r23
Envoyproxy1 product
  • gateway< 1.7.4 | ≥ 1.8.0-rc.0, < 1.8.1
Github.com/envoyproxy1 product
  • gateway< 1.7.4 | ≥ 1.8.0-rc.0, < 1.8.1

4 vendors · 50 products

References

10 links