{"id":"GHSA-38wr-vpc7-2mp4","summary":"dd-trace-dotnet: Improper parsing of W3C baggage headers may lead to DoS","details":"### Impact\nDatadog tracing libraries that implement W3C baggage propagation parse incoming baggage HTTP headers without enforcing item-count or byte-size limits on the extract path. The DD_TRACE_BAGGAGE_MAX_ITEMS (default 64) and DD_TRACE_BAGGAGE_MAX_BYTES (default 8192) limits were applied only to baggage injection, not extraction. A remote, unauthenticated attacker can send a request whose baggage header contains an arbitrarily large number of comma-separated key-value pairs (or a single very large value). The tracer allocates a hash-map entry for each pair on every request, causing unbounded CPU and memory consumption and enabling a remote Denial of Service against any HTTP service that has the baggage propagation style enabled.\nThe baggage propagation style is enabled by default in most affected tracers, so any internet-facing service that has been instrumented with an affected tracer version is exposed unless the propagation style has been explicitly narrowed.\n\n\n### Patches\nThis is resolved in version 3.43.0 and later of the `dd-trace-dotnet` library.\n\n### Workarounds\nIf users cannot upgrade immediately:\n1. Disable `baggage` extraction by removing `baggage` from `DD_TRACE_PROPAGATION_STYLE` (or `DD_TRACE_PROPAGATION_STYLE_EXTRACT` if set independently).\n2. Cap the maximum HTTP request header size at an upstream proxy or web server (for example, Apache `LimitRequestFieldSize`, Nginx `large_client_header_buffers`, Envoy `max_request_headers_kb`).\n\n### Resources\nRelated upstream advisories:\n[opentelemetry-go GHSA-mh2q-q3fh-2475](https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-mh2q-q3fh-2475)\n[opentelemetry-dotnet GHSA-g94r-2vxg-569j](https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2vxg-569j)","aliases":["CVE-2026-50273"],"modified":"2026-07-15T23:26:42.821967Z","published":"2026-07-15T22:59:30Z","database_specific":{"cwe_ids":["CWE-400","CWE-770"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-07-15T22:59:30Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/DataDog/dd-trace-dotnet/security/advisories/GHSA-38wr-vpc7-2mp4"},{"type":"PACKAGE","url":"https://github.com/DataDog/dd-trace-dotnet"}],"affected":[{"package":{"name":"Datadog.Trace","ecosystem":"NuGet","purl":"pkg:nuget/Datadog.Trace"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.43.0"}]}],"versions":["0.1.0","0.1.1","0.1.2","0.1.3","0.2.3-alpha","0.2.4-alpha","0.3.0-beta","0.3.1-beta","0.3.2-beta","0.4.0-beta","0.4.1-beta","0.5.0","0.5.0-beta","0.5.1-beta","0.5.2-beta","0.6.0-beta","0.7.0-beta","0.7.1-beta","0.8.0-beta","0.8.1-beta","0.8.2-beta","1.0.0","1.1.0","1.10.0","1.10.1-prerelease","1.10.2-prerelease","1.10.3-prerelease","1.11.0","1.11.1-prerelease","1.12.0","1.13.0","1.13.2","1.13.3-prerelease","1.13.4-prerelease","1.14.0","1.14.1-prerelease","1.14.2","1.15.0","1.15.1-prerelease","1.16.0","1.16.1","1.16.2","1.16.3-prerelease","1.17.0","1.17.1-prerelease","1.18.0","1.18.1-prerelease","1.18.2","1.18.3","1.19.0","1.19.1","1.19.2","1.19.3","1.19.4","1.19.5","1.19.6-prerelease","1.2.0","1.20.0","1.21.0","1.21.1","1.21.2-prerelease","1.22.0","1.22.1-prerelease","1.22.2-prerelease","1.23.0","1.24.0","1.25.0","1.25.2-prerelease","1.26.0","1.26.1","1.26.2","1.26.3","1.27.0","1.27.1","1.28.0","1.28.1-prerelease","1.28.2","1.28.3-prerelease","1.28.4","1.28.5-prerelease","1.28.6","1.28.7","1.28.8","1.29.0","1.29.1-prerelease","1.30.0","1.30.1","1.31.0","1.31.1","1.31.2","1.4.0","1.4.1","1.6.0","1.6.1","1.6.2","1.7.0","1.8.0","1.9.0","1.9.1-prerelease","2.0.0-prerelease","2.0.1","2.1.0","2.1.1","2.10.0","2.11.0","2.12.0","2.13.0","2.14.0","2.15.0","2.16.0","2.17.0","2.18.0","2.19.0","2.2.0","2.20.0","2.21.0","2.22.0","2.23.0","2.24.0","2.24.1","2.25.0","2.26.0","2.27.0","2.28.0","2.29.0","2.3.0","2.30.0","2.31.0","2.32.0","2.33.0","2.34.0","2.35.0","2.36.0","2.37.0","2.38.0","2.39.0","2.4.0","2.4.1","2.4.2","2.4.3","2.4.4","2.40.0","2.41.0","2.42.0","2.43.0","2.44.0","2.45.0","2.46.0","2.47.0","2.48.0","2.49.0","2.5.0","2.5.1","2.50.0","2.51.0","2.52.0","2.53.0","2.53.1","2.53.2","2.54.0","2.55.0","2.56.0","2.57.0","2.58.0","2.59.0","2.6.0","2.60.0","2.61.0","2.7.0","2.8.0","2.9.0","3.0.0-prerelease","3.1.0-prerelease","3.10.0","3.10.1","3.10.2","3.11.0","3.11.1","3.12.0","3.13.0","3.14.0","3.14.1","3.14.2","3.14.3","3.15.0","3.16.0","3.17.0","3.18.0","3.19.0","3.2.0","3.20.0","3.20.1","3.21.0","3.22.0","3.23.0","3.24.0","3.24.1","3.25.0","3.26.0","3.26.1","3.26.2","3.26.3","3.27.0","3.28.0","3.29.0","3.3.0","3.3.1","3.30.0","3.31.0","3.32.0","3.32.1","3.33.0","3.34.0","3.35.0","3.36.0","3.37.0","3.38.0","3.39.0","3.4.0","3.4.1","3.40.0","3.41.0","3.42.0","3.5.0","3.6.0","3.6.1","3.7.0","3.8.0","3.9.0","3.9.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-38wr-vpc7-2mp4/GHSA-38wr-vpc7-2mp4.json"}},{"package":{"name":"Datadog.Trace.OpenTracing","ecosystem":"NuGet","purl":"pkg:nuget/Datadog.Trace.OpenTracing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.43.0"}]}],"versions":["0.2.3-alpha","0.2.4-alpha","0.3.0-beta","0.3.1-beta","0.3.2-beta","0.4.0-beta","0.4.1-beta","0.5.0","0.5.0-beta","0.5.1-beta","0.5.2-beta","0.6.0-beta","0.7.0-beta","0.7.1-beta","0.8.0-beta","0.8.1-beta","0.8.2-beta","1.0.0","1.10.0","1.10.1-prerelease","1.10.3-prerelease","1.11.0","1.11.1-prerelease","1.12.0","1.13.0","1.13.4-prerelease","1.14.0","1.14.2","1.15.0","1.15.1-prerelease","1.16.0","1.16.1","1.16.2","1.16.3-prerelease","1.17.0","1.17.1-prerelease","1.18.0","1.18.1-prerelease","1.18.2","1.18.3","1.19.0","1.19.1","1.19.2","1.19.3","1.19.4","1.19.5","1.19.6-prerelease","1.2.0","1.20.0","1.21.0","1.21.1","1.21.2-prerelease","1.22.0","1.22.1-prerelease","1.22.2-prerelease","1.23.0","1.24.0","1.25.0","1.25.2-prerelease","1.26.0","1.26.1","1.26.2","1.26.3","1.27.0","1.27.1","1.28.0","1.28.1-prerelease","1.28.2","1.28.3-prerelease","1.28.4","1.28.5-prerelease","1.28.6","1.28.7","1.28.8","1.29.0","1.29.1-prerelease","1.30.0","1.30.1","1.31.0","1.31.1","1.31.2","1.4.0","1.4.1","1.6.0","1.6.1","1.6.2","1.7.0","1.8.0","1.9.0","1.9.1-prerelease","2.0.0-prerelease","2.0.1","2.1.0","2.1.1","2.10.0","2.11.0","2.12.0","2.13.0","2.14.0","2.15.0","2.16.0","2.17.0","2.18.0","2.19.0","2.2.0","2.20.0","2.21.0","2.22.0","2.23.0","2.24.0","2.24.1","2.25.0","2.26.0","2.27.0","2.28.0","2.29.0","2.3.0","2.30.0","2.31.0","2.32.0","2.33.0","2.34.0","2.35.0","2.36.0","2.37.0","2.38.0","2.39.0","2.4.0","2.4.1","2.4.2","2.4.3","2.4.4","2.40.0","2.41.0","2.42.0","2.43.0","2.44.0","2.45.0","2.46.0"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