Description
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.23.0 until 1.35.11, 1.36.7, 1.37.3, and 1.38.1, a vulnerability has been identified in Envoy's zstd decompressor implementation (ZstdDecompressorImpl). When zstd decompression is enabled, processing a specially crafted, highly compressed zstd payload can lead to massive memory allocation. An attacker can exploit this to cause severe memory exhaustion, potentially resulting in an Out-Of-Memory (OOM) kill and Denial of Service (DoS) for the Envoy proxy. This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| envoyproxy | envoy | >= 1.38.0, < 1.38.1; >= 1.37.0, < 1.37.3; >= 1.36.0, < 1.36.7; >= 1.23.0, < 1.35.11 |
References
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-m3p9-47wh-88wgMitigation, Vendor Advisory, Exploit
Timeline
- Published
- Jun 26, 2026
- Last modified
- Oct 25, 2026
- NVD status
- Analyzed