CVE-2026-48044 — Envoy Zstd Decompressor: Ratio Check at Wrong Loop Depth lead to memory explosion

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
envoyproxy / envoy	affected >= 1.38.0, < 1.38.1; affected >= 1.37.0, < 1.37.3; affected >= 1.36.0, < 1.36.7; affected >= 1.23.0, < 1.35.11

CWE

CWE-409

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-m3p9-47wh-88wg

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.