Envoy: Race condition in Dynamic Forward Proxy leads to use-after-free and segmentation faults
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 | — |
| Source | ID | Title |
|---|---|---|
EUVD |
EUVD-2025-26470 | Envoy: Race condition in Dynamic Forward Proxy leads to use-after-free and segmentation faults |
Github GHSA |
GHSA-g9vw-6pvx-7gmw | Envoy: Race condition in Dynamic Forward Proxy leads to use-after-free and segmentation faults |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.495% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* cpe:2.3:a:envoyproxy:envoy:1.35.0:*:*:*:*:*:*:* |
| Type | Values Removed | Values Added |
|---|---|---|
| References |
| |
| Metrics |
threat_severity
|
threat_severity
|
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Envoyproxy
Envoyproxy envoy |
|
| Vendors & Products |
Envoyproxy
Envoyproxy envoy |
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. Versions 1.34.0 through 1.34.4 and 1.35.0 contain a use-after-free (UAF) vulnerability in the DNS cache, causing abnormal process termination. The vulnerability is in Envoy's Dynamic Forward Proxy implementation, occurring when a completion callback for a DNS resolution triggers new DNS resolutions or removes existing pending resolutions. This condition may occur when the following conditions are met: dynamic Forwarding Filter is enabled, the `envoy.reloadable_features.dfp_cluster_resolves_hosts` runtime flag is enabled, and the Host header is modified between the Dynamic Forwarding Filter and Router filters. This issue is resolved in versions 1.34.5 and 1.35.1. To work around this issue, set the envoy.reloadable_features.dfp_cluster_resolves_hosts runtime flag to false. | |
| Title | Envoy: Race condition in Dynamic Forward Proxy leads to use-after-free and segmentation faults | |
| Weaknesses | CWE-416 | |
| References |
| |
| Metrics |
cvssV3_1
|