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CVE PROGRAM SOURCE RECORD6.5 Medium

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

envoyproxy envoy

  • >= 1.38.0, < 1.38.3affected
  • >= 1.37.0, < 1.37.5affected
  • >= 1.36.0, < 1.36.9affected
  • >= 1.34.0, < 1.35.13affected

References