{"id":"CVE-2026-40182","state":"PUBLISHED","title":"OpenTelemetry dotnet: OTLP exporter reads unbounded HTTP response bodies","description":"OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed. This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response. This vulnerability is fixed in 1.15.2.","publishedAt":"2026-04-23T17:51:34.961Z","updatedAt":"2026-04-23T18:38:57.155Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["open-telemetry opentelemetry-dotnet"],"affected":[{"vendor":"open-telemetry","product":"opentelemetry-dotnet","versions":[{"version":">= 1.13.1, < 1.15.2","status":"affected"}]}],"references":["https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-q834-8qmm-v933","https://github.com/open-telemetry/opentelemetry-dotnet/pull/6564","https://github.com/open-telemetry/opentelemetry-dotnet/pull/7017","https://github.com/open-telemetry/opentelemetry-proto/pull/781"],"weaknesses":["CWE-789"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/40xxx/CVE-2026-40182.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-40182","state":"PUBLISHED","datePublished":"2026-04-23T17:51:34.961Z","dateUpdated":"2026-04-23T18:38:57.155Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-09T20:59:17.619Z"},"containers":{"cna":{"title":"OpenTelemetry dotnet: OTLP exporter reads unbounded HTTP response bodies","descriptions":[{"lang":"en","value":"OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed. This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response. This vulnerability is fixed in 1.15.2."}],"affected":[{"vendor":"open-telemetry","product":"opentelemetry-dotnet","versions":[{"version":">= 1.13.1, < 1.15.2","status":"affected"}]}],"references":[{"url":"https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-q834-8qmm-v933","name":"https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-q834-8qmm-v933","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/6564","name":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/6564","tags":["x_refsource_MISC"]},{"url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/7017","name":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/7017","tags":["x_refsource_MISC"]},{"url":"https://github.com/open-telemetry/opentelemetry-proto/pull/781","name":"https://github.com/open-telemetry/opentelemetry-proto/pull/781","tags":["x_refsource_MISC"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-789","lang":"en","description":"CWE-789: Memory Allocation with Excessive Size Value","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-23T17:51:34.961Z"},"source":{"advisory":"GHSA-q834-8qmm-v933","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-23T18:38:48.491134Z","id":"CVE-2026-40182","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-23T18:38:57.155Z"}}]}}}