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6.6 Medium

CVE-2025-62409 Envoy is a cloud-native, open source edge and service proxy

Description

Envoy is a cloud-native, open source edge and service proxy. Prior to 1.36.1, 1.35.5, 1.34.9, and 1.33.10, large requests and responses can potentially trigger TCP connection pool crashes due to flow control management in Envoy. It will happen when the connection is closing but upstream data is still coming, resulting in a buffer watermark callback nullptr reference. The vulnerability impacts TCP proxy and HTTP 1 & 2 mixed use cases based on ALPN. This vulnerability is fixed in 1.36.1, 1.35.5, 1.34.9, and 1.33.10.

Affected products and versions

Product Affected versions Fixed in
envoy 1.36 1.36.0 → < 1.36.1 1.36.1
envoy 1.35 1.35.0 → < 1.35.5 1.35.5
envoy 1.34 1.34.0 → < 1.34.9 1.34.9
envoy 1.33 earliest → < 1.33.10 1.33.10

References

Timeline

  1. Published
  2. Last modified

Other CVEs of envoy

The 98 CVEs of envoy →
CVE-2026-73511 Envoy is an open source edge and service proxy designed for cloud-native applications 5.3 Medium CVE-2026-73553 Envoy is an open source edge and service proxy designed for cloud-native applications 7.5 High CVE-2026-73551 Envoy is an open source edge and service proxy designed for cloud-native applications 5.3 Medium CVE-2026-73546 Envoy is an open source edge and service proxy designed for cloud-native applications 7.4 High
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