CVE-2026-47207

Summary

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 Software

VendorProductVersion RangeStatus
envoyproxyenvoy>= 1.38.0, < 1.38.3affected
envoyproxyenvoy>= 1.37.0, < 1.37.5affected
envoyproxyenvoy>= 1.36.0, < 1.36.9affected
envoyproxyenvoy>= 1.34.0, < 1.35.13affected

Weaknesses

  • CWE-416: CWE-416: Use After Free

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: partial

Additional References

References