{"id":"CVE-2026-48044","state":"PUBLISHED","title":"Envoy Zstd Decompressor: Ratio Check at Wrong Loop Depth lead to memory explosion","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.","publishedAt":"2026-06-26T17:31:37.602Z","updatedAt":"2026-06-26T18:31:20.280Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["envoyproxy envoy"],"affected":[{"vendor":"envoyproxy","product":"envoy","versions":[{"version":">= 1.38.0, < 1.38.1","status":"affected"},{"version":">= 1.37.0, < 1.37.3","status":"affected"},{"version":">= 1.36.0, < 1.36.7","status":"affected"},{"version":">= 1.23.0, < 1.35.11","status":"affected"}]}],"references":["https://github.com/envoyproxy/envoy/security/advisories/GHSA-m3p9-47wh-88wg"],"weaknesses":["CWE-409"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/48xxx/CVE-2026-48044.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-48044","state":"PUBLISHED","datePublished":"2026-06-26T17:31:37.602Z","dateUpdated":"2026-06-26T18:31:20.280Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-20T18:15:53.578Z"},"containers":{"cna":{"title":"Envoy Zstd Decompressor: Ratio Check at Wrong Loop Depth lead to memory explosion","descriptions":[{"lang":"en","value":"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":[{"vendor":"envoyproxy","product":"envoy","versions":[{"version":">= 1.38.0, < 1.38.1","status":"affected"},{"version":">= 1.37.0, < 1.37.3","status":"affected"},{"version":">= 1.36.0, < 1.36.7","status":"affected"},{"version":">= 1.23.0, < 1.35.11","status":"affected"}]}],"references":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-m3p9-47wh-88wg","name":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-m3p9-47wh-88wg","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-409","lang":"en","description":"CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-26T17:31:37.602Z"},"source":{"advisory":"GHSA-m3p9-47wh-88wg","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-26T18:31:06.118463Z","id":"CVE-2026-48044","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-26T18:31:20.280Z"}}]}}}