Is CVE-2026-47220 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-47220 being exploited in the wild.

How severe is CVE-2026-47220?

High severity, with a CVSS score of 7.5, published 26 June 2026.

Which products and versions are affected?

Envoy Proxy Envoy 1.37.0 to 1.37.4, 1.38.0 to 1.38.2.

Is there a fix for CVE-2026-47220?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-47220 attacked?

It is attacked over the network, in a hosted service.

Am I affected by CVE-2026-47220?

Check whether you run Envoy Proxy Envoy at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-47220: Envoy denial of service via NULL pointer dereference in log formatting

CVE-2026-47220 · Severity: high · CVSS 7.5 · Published 2026-06-26

Envoy, a widely used tool for managing network traffic in cloud environments, is vulnerable to a flaw that can cause the service to crash. If the system is configured to log specific server names and receives a request missing certain expected information, the entire proxy service may shut down. This results in a denial-of-service, potentially cutting off access to applications and services relying on Envoy for connectivity.

Technologies: Envoy Proxy Envoy. Vendors: Envoy Proxy.

Quick answers

Is CVE-2026-47220 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-47220 being exploited in the wild.
How severe is CVE-2026-47220?: High severity, with a CVSS score of 7.5, published 26 June 2026.
Which products and versions are affected?: Envoy Proxy Envoy 1.37.0 to 1.37.4, 1.38.0 to 1.38.2.
Is there a fix for CVE-2026-47220?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-47220 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-47220?: Check whether you run Envoy Proxy Envoy at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A NULL pointer dereference (CWE-476) exists in Envoy's handling of the %REQUESTED_SERVER_NAME(X:Y)% log format specifier. When host-related fallback options such as HOST_FIRST or SNI_FIRST are enabled, the handler fails to validate the presence of the :authority or x-envoy-original-host headers. If a request is received where these headers are missing or null, Envoy attempts to access the null memory address, resulting in a segmentation fault and service crash. This is reachable over the network without authentication. The issue is resolved in versions 1.37.5 and 1.38.3.

Affected products

Envoy Proxy Envoy 1.37.0 to 1.37.4, 1.38.0 to 1.38.2

Timeline

2026-06-23: advisory: GitHub Security Advisory published
2026-06-26: disclosed: NVD publication date

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v

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