CVE-2026-53715
Description
A flaw was found in Envoy Gateway. Improper synchronization in the Wasm cache handling allows an attacker with pod-network access and tenant permissions to trigger a race condition. By flooding GET requests, an attacker can cause a read-write overlap, leading to the termination of the controller process. This results in a timing-dependent, cross-tenant control-plane Denial of Service (DoS) until the affected pod is restarted.
Statement
Red Hat Connectivity Link includes an affected Envoy Gateway version below 1.7.4. An authorized tenant with pod-network access can trigger a timing-dependent controller crash by concurrently flooding the unauthenticated Wasm cache endpoint and churning policies with distinct Wasm URLs.
Mitigation
Restrict pod-network access to port 18002 and limit untrusted tenants' permission to create or modify EnvoyExtensionPolicy resources. These controls reduce exposure but do not eliminate the race for authorized users.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | N/A | 5.3 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | High |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Integrity,Confidentiality,Other
Technical Impact: Modify Application Data; Read Application Data; Alter Execution Logic
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