{"id":"CVE-2023-35945","revision":null,"records":[{"revision":"d8fdccd3279d45219b68876b5a35561b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2023-35945","aliases":[],"title":"Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec","description":"Envoy is a cloud-native high-performance edge/middle/service proxy. Envoy’s HTTP/2 codec may leak a header map and bookkeeping structures upon receiving `RST_STREAM` immediately followed by the `GOAWAY` frames from an upstream server. In nghttp2, cleanup of pending requests due to receipt of the `GOAWAY` frame skips de-allocation of the bookkeeping structure and pending compressed header. The error return [code path] is taken if connection is already marked for not sending more requests due to `GOAWAY` frame. The clean-up code is right after the return statement, causing memory leak. Denial of service through memory exhaustion. This vulnerability was patched in versions(s) 1.26.3, 1.25.8, 1.24.9, 1.23.11.","state":0,"publishedAt":"2023-07-13T20:41:15.69+00:00","modifiedAt":"2026-10-14T23:34:56.207+00:00","affected":[{"ecosystem":"Vendor product","name":"envoy","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"envoyproxy\",\n                    \"product\": \"envoy\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 1.26.0, < 1.26.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 1.25.0, < 1.25.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 1.24.0, < 1.24.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 1.23.0, < 1.23.11\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/envoyproxy/envoy/security/advisories/GHSA-jfxv-29pc-x22r","https://github.com/nghttp2/nghttp2/blob/e7f59406556c80904b81b593d38508591bb7523a/lib/nghttp2_session.c#L3346"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-35945","license":"CVE Program Terms of Use","key":"cve-program:CVE-2023-35945","identifiers":["CVE-2023-35945"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-5522e4ae35aa4bdc9d39e95136c0428b","complete":false,"records":13672,"lastAttemptAt":"2026-11-09T22:17:03.1981375+00:00","lastSuccessAt":"2026-11-09T22:17:03.194+00:00","error":"27 identifier lookups failed; latest failures include HTTP 403. Other identifiers were checked independently.","lastVerifiedAt":"2026-11-09T22:17:03.194+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13207,"expectedIdentifiers":13725,"failedIdentifiers":27},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-09T22:04:21.7510311+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T22:04:21.7510311+00:00","lastSuccessAt":"2026-11-09T22:04:21.9181937+00:00","error":null,"lastVerifiedAt":"2026-11-09T22:04:21.9181977+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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