{"id":"CVE-2026-40894","summary":"OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation headers","details":"OpenTelemetry dotnet is a dotnet telemetry framework. In OpenTelemetry.Api 0.5.0-beta.2 to 1.15.2 and OpenTelemetry.Extensions.Propagators 1.3.1 to 1.15.2, The implementation details of the baggage, B3 and Jaeger processing code in the OpenTelemetry.Api and OpenTelemetry.Extensions.Propagators NuGet packages can allocate excessive memory when parsing which could create a potential denial of service (DoS) in the consuming application. This vulnerability is fixed in 1.15.3.","aliases":["GHSA-g94r-2vxg-569j"],"modified":"2026-07-15T01:48:58.232139215Z","published":"2026-04-23T18:03:28.211Z","related":["CGA-ffr3-2hwj-qvrg"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-789"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40894.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40894.json"},{"type":"ADVISORY","url":"https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2vxg-569j"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40894"},{"type":"FIX","url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/1048"},{"type":"FIX","url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/3244"},{"type":"FIX","url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/3309"},{"type":"FIX","url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/533"},{"type":"FIX","url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/7061"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/open-telemetry/opentelemetry-dotnet","events":[{"introduced":"0"},{"fixed":"d622e6c7c899527638b53a6b06919859f5752add"}],"database_specific":{"extracted_events":[{"introduced":"0.5.0"},{"fixed":"1.15.3"},{"introduced":"0"}],"source":"CPE_RANGE","cpe":["cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:.net:*:*","cpe:2.3:a:opentelemetry:opentelemetry.api:*:*:*:*:*:.net:*:*","cpe:2.3:a:opentelemetry:opentelemetry.extensions.propagators:*:*:*:*:*:*:*:*"]}}],"versions":["coreunstable-1.15.2-beta.1","core-1.15.2","coreunstable-1.15.1-beta.1","core-1.15.1","coreunstable-1.15.0-beta.1","core-1.15.0","coreunstable-1.14.0-beta.1","core-1.14.0","core-1.14.0-rc.1","coreunstable-1.13.1-beta.1","core-1.13.1","coreunstable-1.13.0-beta.1","core-1.13.0","coreunstable-1.12.0-beta.1","core-1.12.0","coreunstable-1.11.2-beta.1","core-1.11.2","core-1.11.1","coreunstable-1.11.0-beta.1","core-1.11.0","core-1.11.0-rc.1","coreunstable-1.10.0-beta.1","core-1.10.0","core-1.10.0-rc.1","core-1.10.0-beta.1","coreunstable-1.9.0-beta.2","coreunstable-1.9.0-beta.1","core-1.9.0","core-1.9.0-rc.1","coreunstable-1.9.0-alpha.2","coreunstable-1.9.0-alpha.1","core-1.9.0-alpha.1","core-1.8.0","Instrumentation.Http-1.8.1","Instrumentation.AspNetCore-1.8.1","Instrumentation.SqlClient-1.8.0-beta.1","Instrumentation.Http-1.8.0","Instrumentation.GrpcNetClient-1.8.0-beta.1","Instrumentation.AspNetCore-1.8.0","core-1.8.0-rc.1","core-1.8.0-beta.1","Instrumentation.SqlClient-1.7.0-beta.1","Instrumentation.Http-1.7.1","Instrumentation.GrpcNetClient-1.7.0-beta.1","Instrumentation.AspNetCore-1.7.1","Instrumentation.Http-1.7.0","Instrumentation.AspNetCore-1.7.0","Instrumentation.Http-1.6.0","Instrumentation.AspNetCore-1.6.0","core-1.7.0","1.7.0-beta.1","1.6.0-rc.1","core-1.7.0-rc.1","1.6.0-beta.3","1.6.0-beta.2","core-1.7.0-alpha.1","core-1.6.0","1.6.0-beta.1","core-1.6.0-rc.1","1.5.1-beta.1","core-1.6.0-alpha.1","core-1.5.0","1.5.0-beta.1","core-1.5.0-rc.1","core-1.5.0-alpha.1","core-1.4.0","1.0.0-rc9.14","core-1.4.0-rc.4","1.0.0-rc9.13","core-1.4.0-rc.3","1.0.0-rc9.12","core-1.4.0-rc.2","1.0.0-rc9.11","core-1.4.0-rc.1","1.0.0-rc9.10","core-1.4.0-beta.3","1.0.0-rc9.9","core-1.4.0-beta.2","1.0.0-rc9.8","core-1.4.0-beta.1","1.0.0-rc9.7","core-1.3.0","1.0.0-rc9.4","core-1.4.0-alpha.2","1.0.0-rc9.6","core-1.4.0-alpha.1","1.0.0-rc9.5","core-1.3.0-rc.2","core-1.3.0-beta.2","core-1.3.0-beta.1","1.0.0-rc9.3","core-1.2.0","core-1.2.0-rc5","1.0.0-rc9.2","core-1.2.0-rc4","1.0.0-rc9.1","core-1.2.0-rc3","1.0.0-rc10","core-1.2.0-rc2","1.0.0-rc9","core-1.2.0-rc1","core-1.2.0-beta2","core-1.2.0-beta1","1.0.0-rc8","core-1.2.0-alpha4","core-1.2.0-alpha3","core-1.2.0-alpha2","core-1.2.0-alpha1","core-1.1.0","1.0.0-rc7","core-1.1.0-rc1","1.0.0-rc6","core-1.1.0-beta4","1.0.0-rc5","core-1.1.0-beta3","core-1.1.0-beta2","1.0.0-rc4","core-1.1.0-beta1","1.0.0-rc3","core-1.0.1","core-1.0.0-rc4","core-1.0.0-rc3","1.0.0-rc2","1.0.0-rc1","0.8.0-beta","0.7.0-beta","0.6.0-beta","0.5.0-beta","0.4.0-beta","0.3.0-beta","0.2.0-alpha"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40894.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}