{"id":"CVE-2026-40891","sourceIdentifier":"security-advisories@github.com","published":"2026-04-23T18:16:28.483","lastModified":"2026-06-17T10:45:50.140","vulnStatus":"Analyzed","cveTags":[],"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"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"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"ADJACENT_NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.6,"impactScore":3.6},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"ADJACENT_NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.6,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-23T18:22:43.489569Z","id":"CVE-2026-40891","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-789"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:.net:*:*","versionStartIncluding":"1.13.1","versionEndExcluding":"1.15.3","matchCriteriaId":"9BACBB49-0AF7-4FB3-AAFB-1C9AB3E43F60"}]}]}],"references":[{"url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980","source":"security-advisories@github.com","tags":["Issue Tracking","Patch"]},{"url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064","source":"security-advisories@github.com","tags":["Issue Tracking","Patch"]},{"url":"https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p","source":"security-advisories@github.com","tags":["Mitigation","Vendor Advisory"]}]}