{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-40891","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-04-15T16:37:22.766Z","datePublished":"2026-04-23T17:54:36.033Z","dateUpdated":"2026-04-23T18:23:08.858Z"},"containers":{"cna":{"title":"OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling","problemTypes":[{"descriptions":[{"cweId":"CWE-789","lang":"en","description":"CWE-789: Memory Allocation with Excessive Size Value","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p","tags":["x_refsource_CONFIRM"],"url":"https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p"},{"name":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980","tags":["x_refsource_MISC"],"url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980"},{"name":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064","tags":["x_refsource_MISC"],"url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064"}],"affected":[{"vendor":"open-telemetry","product":"opentelemetry-dotnet","versions":[{"version":">= 1.13.1, < 1.15.3","status":"affected"}]},{"vendor":"open-telemetry","product":"OpenTelemetry.Exporter.OpenTelemetryProtocol","versions":[{"version":">= 1.13.1, < 1.15.3","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-04-23T17:54:36.033Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-mr8r-92fq-pj8p","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-23T18:22:43.489569Z","id":"CVE-2026-40891","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-23T18:23:08.858Z"}}]}}