CVE-2026-53718

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Source
https://cve.org/CVERecord?id=CVE-2026-53718
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53718.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-53718
Aliases
Downstream
CGA (72)
CLEANSTART (4)
MINI (6)
openSUSE (1)
Related
Published
2026-09-14T20:12:12Z
Modified
2026-10-16T02:59:59Z
Severity
  • 6.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L CVSS Calculator
Summary
Envoy Gateway custom backendRef cross-namespace ReferenceGrant bypass
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-862"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53718.json"
}
References

Affected packages

Git / github.com/envoyproxy/gateway

Affected ranges

Type
GIT
Repo
https://github.com/envoyproxy/gateway
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
062b176235b72d339fac340d23dd37679b36dca6
Introduced
6d06f23e29068a7c8a5a9af5fc7a189807f031aa
Fixed
097ab899b9d041452d02f15d738514eda10ea21b
Fixed
5a78db82b7cf4fc5bebbeda2c50952892038a464
Fixed
96e2b750868a459ace4b8b68e6a6e4fb0152b9b7
Fixed
b4737180c7e597490c6363075c565fa8cf24eead
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.7.4"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "introduced":  "1.8.0-rc.0"
                },
                {
                    "fixed":  "1.8.1"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "5a78db82b7cf4fc5bebbeda2c50952892038a464"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "96e2b750868a459ace4b8b68e6a6e4fb0152b9b7"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "b4737180c7e597490c6363075c565fa8cf24eead"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v1.7.4",
            "range":  [
                {
                    "fixed":  "062b176235b72d339fac340d23dd37679b36dca6"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "original_tag":  "v1.8.1",
            "range":  [
                {
                    "fixed":  "097ab899b9d041452d02f15d738514eda10ea21b"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

Other
latest
v0.*
v0.1.0
v0.2.0
v0.2.0-rc1
v0.2.0-rc2
v0.5.0-rc.1
v1.*
v1.6.0-rc.0
v1.7.0
v1.7.0-rc.0
v1.7.0-rc.1
v1.7.0-rc.2
v1.7.1
v1.7.2
v1.7.3
v1.8.0
v1.8.0-rc.0
v1.8.0-rc.1
v1.9.0-rc.0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53718.json"