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.
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Thu, 16 Oct 2025 20:15:00 +0000
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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. | |
Title | Envoy allows large requests and responses to cause TCP connection pool crash | |
Weaknesses | CWE-476 | |
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2025-10-16T19:22:45.332Z
Reserved: 2025-10-13T16:26:12.178Z
Link: CVE-2025-62409

Updated: 2025-10-16T18:27:19.068Z

Status : Received
Published: 2025-10-16T18:15:39.583
Modified: 2025-10-16T20:15:35.897
Link: CVE-2025-62409

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