{"id":"CVE-2026-40891","summary":"OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling","details":"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.","aliases":["GHSA-mr8r-92fq-pj8p"],"modified":"2026-04-28T12:02:26.184706Z","published":"2026-04-23T17:54:36.033Z","related":["CGA-px7w-f925-vh5p"],"database_specific":{"cna_assigner":"GitHub_M","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40891.json","cwe_ids":["CWE-789"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40891.json"},{"type":"FIX","url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980"},{"type":"FIX","url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064"},{"type":"ADVISORY","url":"https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40891"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/open-telemetry/opentelemetry-dotnet","events":[{"introduced":"640cf63628567b76b348b26988920dbc0b5c1662"},{"fixed":"d622e6c7c899527638b53a6b06919859f5752add"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"1.13.1"},{"fixed":"1.15.3"}]}}],"versions":["core-1.13.1","core-1.14.0","core-1.14.0-rc.1","core-1.15.0","core-1.15.1","core-1.15.2","coreunstable-1.13.1-beta.1","coreunstable-1.14.0-beta.1","coreunstable-1.15.0-beta.1","coreunstable-1.15.1-beta.1","coreunstable-1.15.2-beta.1"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-40891.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}