CVE-2026-47204Public exploitNetwork attack vector

Unauthenticated service crash via null upstream dereference

Published Jun 26, 2026 · Updated Jun 26, 2026

Null pointer dereference in Envoy allows remote attackers to crash the proxy with an unauthenticated Connect protocol request. The grpc_stats filter handles Connect content types as gRPC-like traffic and dereferences a missing upstream cluster when a direct_response route bypasses upstream routing. The crash requires grpc_stats and a matching direct_response route; one header-only HTTP request interrupts the entire Envoy process.

CVSS severity6.5
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in Envoy allows remote attackers to crash the proxy with an unauthenticated Connect protocol request. The grpc_stats filter handles Connect content types as gRPC-like traffic and dereferences a missing upstream cluster when a direct_response route bypasses upstream routing. The crash requires grpc_stats and a matching direct_response route; one header-only HTTP request interrupts the entire Envoy process.

The record

CVE
CVE-2026-47204
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
Envoy Proxy
Product
Envoy
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.26.0, < 1.35.13
  2. Affected versionversion=>= 1.36.0, < 1.36.9
  3. Affected versionversion=>= 1.37.0, < 1.37.5
  4. Affected versionversion=>= 1.38.0, < 1.38.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Envoy Proxy · Envoyversion=>= 1.26.0, < 1.35.13; version=>= 1.36.0, < 1.36.9; version=>= 1.37.0, < 1.37.5; version=>= 1.38.0, < 1.38.3

Published CVSS scores

6.5GitHub CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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