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CVE-2026-26330— Envoy global rate limit may crash when the response phase limit is enabled and the response phase request is failed directly

Quick assessment

Affected
envoyproxy envoy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Envoy是Enphase开源的一款用于连接智能家居设备的网关程序。 Envoy 1.37.1之前版本、1.36.5之前版本、1.35.8之前版本和1.34.13之前版本存在资源管理错误漏洞，该漏洞源于速率限制过滤器内部状态清理不当，可能导致应用程序崩溃。

CVSS 5.3 · Medium EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood
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I. Basic Information for CVE-2026-26330

Vulnerability Information
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Vulnerability Title
Envoy global rate limit may crash when the response phase limit is enabled and the response phase request is failed directly
Source: CVE Program / CVE List V5
Vulnerability 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, At the rate limit filter, if the response phase limit with apply_on_stream_done in the rate limit configuration is enabled and the response phase limit request fails directly, it may crash Envoy. When both the request phase limit and response phase limit are enabled, the safe gRPC client instance will be re-used for both the request phase request and response phase request. But after the request phase request is done, the inner state of the request phase limit request in gRPC client is not cleaned up. When a second limit request is sent at response phase, and the second limit request fails directly, the previous request's inner state may be accessed and result in crash. This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是Enphase开源的一款用于连接智能家居设备的网关程序。 Envoy 1.37.1之前版本、1.36.5之前版本、1.35.8之前版本和1.34.13之前版本存在资源管理错误漏洞，该漏洞源于速率限制过滤器内部状态清理不当，可能导致应用程序崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
envoyproxy envoy >= 1.37.0, < 1.37.1 -

II. Public POCs for CVE-2026-26330

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III. Intelligence Information for CVE-2026-26330

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Same Patch Batch · envoyproxy · 2026-03-10 · 5 CVEs total

CVE-2026-26308 7.5 HIGH Envoy has an RBAC Header Validation Bypass via Multi-Value Header Concatenation
CVE-2026-26310 5.9 MEDIUM Crash for scoped ip address in Envoy during DNS
CVE-2026-26311 5.9 MEDIUM Envoy HTTP: filter chain execution on reset streams causing UAF crash
CVE-2026-26309 5.3 MEDIUM Envoy has an off-by-one write in JsonEscaper::escapeString()

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-416

V. Comments for CVE-2026-26330

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