CVE-2026-48044
HIGH
MEDIUM
Priority: 0.04
BB Relevance:
75/100
Published: 2026-06-26
Modified: 2026-10-25
First seen: 2026-10-29
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
Unchanged
C:
None
I:
None
A:
High
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.
Weakness Classification (1)
Affected Software (4)
| Vendor | Product | Version |
|---|---|---|
| envoyproxy | envoy | 1.23.0 – 1.35.13 |
| envoyproxy | envoy | 1.36.0 – 1.36.9 |
| envoyproxy | envoy | 1.37.0 – 1.37.5 |
| envoyproxy | envoy | 1.38.0 – 1.38.3 |
References & Advisories (1)
Mitigation
Vendor Advisory
Exploit