CVE-2026-48044: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) in envoyproxy envoy
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.
AI Analysis
Technical Summary
CVE-2026-48044 is a high-severity vulnerability affecting the Envoy proxy's zstd decompressor (ZstdDecompressorImpl) in versions >=1.23.0 <1.35.11. When zstd decompression is enabled, an attacker can supply a specially crafted, highly compressed payload that triggers massive memory allocation during decompression. This can exhaust system memory, causing the Envoy process to be killed or become unresponsive, resulting in a denial of service. The vulnerability is classified under CWE-409 (Improper Handling of Highly Compressed Data leading to Data Amplification). The issue is resolved in version 1.35.11 and later.
Potential Impact
The vulnerability allows remote attackers to cause severe memory exhaustion on the Envoy proxy by sending maliciously crafted zstd compressed data. This can lead to an Out-Of-Memory kill or crash of the Envoy process, resulting in denial of service. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Upgrade Envoy to version 1.35.11 or later, where this vulnerability is fixed. No official temporary fixes or workarounds are provided. Patch status is not explicitly stated as 'official-fix' in the advisory, but the fixed versions are clearly identified. Users should apply the update to mitigate the risk.
CVE-2026-48044: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) in envoyproxy envoy
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.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-48044 is a high-severity vulnerability affecting the Envoy proxy's zstd decompressor (ZstdDecompressorImpl) in versions >=1.23.0 <1.35.11. When zstd decompression is enabled, an attacker can supply a specially crafted, highly compressed payload that triggers massive memory allocation during decompression. This can exhaust system memory, causing the Envoy process to be killed or become unresponsive, resulting in a denial of service. The vulnerability is classified under CWE-409 (Improper Handling of Highly Compressed Data leading to Data Amplification). The issue is resolved in version 1.35.11 and later.
Potential Impact
The vulnerability allows remote attackers to cause severe memory exhaustion on the Envoy proxy by sending maliciously crafted zstd compressed data. This can lead to an Out-Of-Memory kill or crash of the Envoy process, resulting in denial of service. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Upgrade Envoy to version 1.35.11 or later, where this vulnerability is fixed. No official temporary fixes or workarounds are provided. Patch status is not explicitly stated as 'official-fix' in the advisory, but the fixed versions are clearly identified. Users should apply the update to mitigate the risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-20T18:15:53.578Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3ec10ed9e07477746fae25
Added to database: 06/26/2026, 18:12:30 UTC
Last enriched: 07/06/2026, 23:38:59 UTC
Last updated: 08/10/2026, 00:41:16 UTC
Views: 134
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