Envoy: HTTP RBAC safe_regex can fail open on RFC-valid obs-text header values
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 |
|
Configuration 1 [-]
|
No data.
| Vendor | Product | Versions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Envoyproxy | Envoy |
|
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.490% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* |
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
| Type | Values Removed | Values Added |
|---|---|---|
| Description | No description is available for this CVE. | Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy HTTP RBAC accepts RFC-valid opaque header bytes but evaluates safe_regex values with RE2's UTF-8 subject semantics. A downstream client can preserve a prohibited marker and add an unrelated obs-text octet, causing RE2::FullMatch to return false and a negative RBAC policy to treat the invalid subject as an ordinary no-match. A byte-oriented route matcher can still observe the marker, allowing the request to reach a route intended to be denied. The relevant scope boundary is that plain positive ALLOW regexes normally fail closed, and exact, prefix, suffix, and contains matchers are not shown to have this subject-domain failure. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1. |
| Title | envoy: envoy: RBAC safe_regex fails to match non-UTF-8 HTTP header values | Envoy: HTTP RBAC safe_regex can fail open on RFC-valid obs-text header values |
| Weaknesses | CWE-20 | |
| References |
|
|
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Envoyproxy
Envoyproxy envoy |
|
| Vendors & Products |
Envoyproxy
Envoyproxy envoy |
| Type | Values Removed | Values Added |
|---|---|---|
| Description | No description is available for this CVE. | |
| Title | envoy: envoy: RBAC safe_regex fails to match non-UTF-8 HTTP header values | |
| Weaknesses | CWE-863 | |
| References |
| |
| Metrics |
threat_severity
|
cvssV3_1
|