CVE-2026-47207
Envoy crashes if multiple unexpected ext_proc responses are packed into one gRPC message
Description
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.
INFO
Published Date :
June 26, 2026, 5:52 p.m.
Last Modified :
June 26, 2026, 5:53 p.m.
Remotely Exploit :
Yes !
Source :
GitHub_M
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Upgrade Envoy to a patched version (1.35.13+).
- Upgrade Envoy to a patched version (1.36.9+).
- Upgrade Envoy to a patched version (1.37.5+).
- Upgrade Envoy to a patched version (1.38.3+).
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