Envoy has an RBAC Header Validation Bypass via Multi-Value Header Concatenation
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| envoyproxy | envoy | affected |
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Configuration 1 [-]
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No data.
| Vendor | Product | Versions | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Envoyproxy | Envoy |
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| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-ghc4-35x6-crw5 | Envoy has RBAC Header Validation Bypass via Multi-Value Header Concatenation |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.323% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* cpe:2.3:a:envoyproxy:envoy:1.37.0:*:*:*:*:*:*:* |
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Envoyproxy
Envoyproxy envoy |
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| Vendors & Products |
Envoyproxy
Envoyproxy envoy |
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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| Type | Values Removed | Values Added |
|---|---|---|
| Description | Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, the Envoy RBAC (Role-Based Access Control) filter contains a logic vulnerability in how it validates HTTP headers when multiple values are present for the same header name. Instead of validating each header value individually, Envoy concatenates all values into a single comma-separated string. This behavior allows attackers to bypass RBAC policies—specifically "Deny" rules—by sending duplicate headers, effectively obscuring the malicious value from exact-match mechanisms. This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13. | |
| Title | Envoy has an RBAC Header Validation Bypass via Multi-Value Header Concatenation | |
| Weaknesses | CWE-863 | |
| References |
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| Metrics |
cvssV3_1
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