CVE-2026-47207
Envoy crashes if multiple unexpected ext_proc responses are packed into one gRPC message
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-416 |
| Vendor | envoyproxy |
| Product | envoy |
| Published | Jun 26, 2026 |
| Last Updated | Jun 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
envoyproxy / envoy
>= 1.38.0, < 1.38.3 >= 1.37.0, < 1.37.5 >= 1.36.0, < 1.36.9 >= 1.34.0, < 1.35.13