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CVE-2026-47207— Envoy crashes if multiple unexpected ext_proc responses are packed into one gRPC message

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 Proxy Envoy是Envoy Proxy团队的应用网关。 Envoy Proxy Envoy存在资源管理错误漏洞，该漏洞源于在ext_proc服务器发送包含多个特制ProcessingResponse消息的单个gRPC消息时，批量处理中第一个响应导致gRPC流对象被销毁，进而在后续响应处理中触发释放后重用错误，可能导致Envoy崩溃。以下版本受到影响：1.35.13之前版本的1.34.x版本、1.36.9之前版本的1.36.x版本、1.37.5之前版本的1.37.x版本和1.38.3之前

CVSS 6.5 · Medium EPSS 0.29% · P22

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
envoyproxy envoy >= 1.38.0, < 1.38.3 affected
>= 1.37.0, < 1.37.5 affected
>= 1.36.0, < 1.36.9 affected
>= 1.34.0, < 1.35.13 affected
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I. Basic Information for CVE-2026-47207

Vulnerability Information
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Vulnerability Title
Envoy crashes if multiple unexpected ext_proc responses are packed into one gRPC message
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, Envoy crashes if an ext_proc server sends a single gRPC message containing multiple, specially crafted ProcessingResponse messages. This can occur when the first response in the batch causes the gRPC stream object to be destroyed, leading to a use-after-free error when Envoy attempts to process subsequent responses in the same gRPC message. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/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 Proxy Envoy 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy Proxy Envoy是Envoy Proxy团队的应用网关。 Envoy Proxy Envoy存在资源管理错误漏洞，该漏洞源于在ext_proc服务器发送包含多个特制ProcessingResponse消息的单个gRPC消息时，批量处理中第一个响应导致gRPC流对象被销毁，进而在后续响应处理中触发释放后重用错误，可能导致Envoy崩溃。以下版本受到影响：1.35.13之前版本的1.34.x版本、1.36.9之前版本的1.36.x版本、1.37.5之前版本的1.37.x版本和1.38.3之前
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 >= 1.38.0, < 1.38.3 -

II. Public POCs for CVE-2026-47207

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III. Intelligence Information for CVE-2026-47207

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Vendor Advisories for CVE-2026-47207 (1)

Same Patch Batch · envoyproxy · 2026-06-26 · 14 CVEs total

CVE-2026-48743 7.5 HIGH Envoy: HTTP/3 to HTTP/1 request smuggling via headers-only request with nonzero Content-Le
CVE-2026-48042 7.5 HIGH Envoy: Stack overflow in destructor of highly nested JSON
CVE-2026-48044 7.5 HIGH Envoy Zstd Decompressor: Ratio Check at Wrong Loop Depth lead to memory explosion
CVE-2026-47220 7.5 HIGH Envoy: Segmentation fault when using %REQUESTED_SERVER_NAME% in log format
CVE-2026-47775 6.8 MEDIUM Envoy OAuth2 Filter: Padding Oracle via AES-256-CBC Cookie Decryption
CVE-2026-47204 6.5 MEDIUM Envoy: grpc_stats filter segfault on Connect protocol requests to direct_response routes
CVE-2026-47221 5.9 MEDIUM Envoy: Null pointer deref in internal redirects
CVE-2026-48497 5.9 MEDIUM Envoy: Abnormal process termination in DNS UDP filter
CVE-2026-48706 5.9 MEDIUM Envoy Heap Buffer Overflow in TcpStatsdSink
CVE-2026-47205 5.9 MEDIUM Envoy: ext_authz Use-After-Free during Stream Teardown with Per-Route Overrides
CVE-2026-48090 5.9 MEDIUM Envoy HTTP: OAuth2 filter late async token completion after stream teardown (UAF / crash r
CVE-2026-47692 4.8 MEDIUM Envoy: PROXY Protocol v2 header generator emits "skipped" TLVs, causing 65 KB attacker-con
CVE-2026-47778 4.4 MEDIUM Envoy: Embedded NUL in TLS DNS SAN Truncation in the Default TLS Certificate Validator. (A

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-47207

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