envoyproxy envoy up to 1.35.12/1.36.8/1.37.4/1.38.2 ProcessingResponse use after free

Summaryinfo

A vulnerability, which was classified as critical, was found in envoyproxy envoy up to 1.35.12/1.36.8/1.37.4/1.38.2. This issue affects some unknown processing of the component ProcessingResponse Handler. The manipulation results in use after free. This vulnerability is cataloged as CVE-2026-47207. The attack may be launched remotely. There is no exploit available. You should 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. It has been classified as critical. Affected is some unknown functionality of the component ProcessingResponse Handler. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-47207 since 05/19/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The technical details are unknown and an exploit is not available.

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

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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

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CPE 2.2info

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