envoyproxy envoy up to 1.35.12/1.36.8/1.37.4/1.38.2 Connect Protocol null pointer dereference

Summaryinfo

A vulnerability, which was classified as problematic, has been found in envoyproxy envoy up to 1.35.12/1.36.8/1.37.4/1.38.2. This vulnerability affects unknown code of the component Connect Protocol. The manipulation leads to null pointer dereference. This vulnerability is listed as CVE-2026-47204. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in envoyproxy envoy up to 1.35.12/1.36.8/1.37.4/1.38.2 and classified as problematic. This issue affects an unknown functionality of the component Connect Protocol. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.26.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, the envoy.filters.http.grpc_stats filter crashes (null pointer dereference / segfault) when a Connect protocol request (Content-Type: application/connect+proto or application/connect+json) hits a direct_response route. A single unauthenticated HTTP request crashes the Envoy process. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-47204 since 05/19/2026. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available.

Upgrading to version 1.35.13, 1.36.9, 1.37.5 or 1.38.3 eliminates this vulnerability.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Firewall Software

Vendor

• envoyproxy

Name

• envoy

Version

• 1.35.0
• 1.35.1
• 1.35.2
• 1.35.3
• 1.35.4
• 1.35.5
• 1.35.6
• 1.35.7
• 1.35.8
• 1.35.9
• 1.35.10
• 1.35.11
• 1.35.12
• 1.36.0
• 1.36.1
• 1.36.2
• 1.36.3
• 1.36.4
• 1.36.5
• 1.36.6
• 1.36.7
• 1.36.8
• 1.37.0
• 1.37.1
• 1.37.2
• 1.37.3
• 1.37.4
• 1.38.0
• 1.38.1
• 1.38.2

License

• free

Website

• Product: https://github.com/envoyproxy/envoy/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion