{"id":"CVE-2026-40891","revision":"330f28d4c8b44f11920fcdd1b464fce9","records":[{"revision":"330f28d4c8b44f11920fcdd1b464fce9","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-40891","aliases":[],"title":"OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling","description":"OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry over gRPC using the OpenTelemetry Protocol (OTLP), the exporter may parse a server-provided grpc-status-details-bin trailer during retry handling. Prior to the fix, a malformed trailer could encode an extremely large length-delimited protobuf field which was used directly for allocation, allowing excessive memory allocation and potential denial of service (DoS). This vulnerability is fixed in 1.15.2.","state":0,"publishedAt":"2026-04-23T17:54:36.033+00:00","modifiedAt":"2026-04-23T18:23:08.858+00:00","affected":[{"ecosystem":"Vendor product","name":"opentelemetry-dotnet","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"open-telemetry\",\n                    \"product\": \"opentelemetry-dotnet\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 1.13.1, < 1.15.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"OpenTelemetry.Exporter.OpenTelemetryProtocol","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"open-telemetry\",\n                    \"product\": \"OpenTelemetry.Exporter.OpenTelemetryProtocol\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 1.13.1, < 1.15.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p","https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980","https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-40891","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-40891","identifiers":["CVE-2026-40891"]},"retained":false,"historicalAffected":[]}],"coverage":[]}