{"id":"CVE-2026-50272","aliases":["GHSA-wxqq-gcq8-c443"],"url":"https://o3.security/vulnerability/CVE-2026-50272","summary":"dd-trace: 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### Patches\nThis is resolved in version 5.100.0 and later of the `dd-trace-js` 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\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)","published":"2026-07-17T20:28:21.250Z","modified":"2026-08-12T03:51:16.084952788Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00793,"percentile":0.54652,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"dd-trace","fixedVersion":"5.100.0"}],"fix":{"url":"https://github.com/DataDog/dd-trace-js/commit/a7d4c0da05f67cde05a99272b725a317c461d0e6","label":"DataDog/dd-trace-js@a7d4c0d"},"references":[{"type":"WEB","url":"https://github.com/DataDog/dd-trace-js/releases/tag/v5.100.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50272.json"},{"type":"ADVISORY","url":"https://github.com/DataDog/dd-trace-js/security/advisories/GHSA-wxqq-gcq8-c443"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50272"},{"type":"FIX","url":"https://github.com/DataDog/dd-trace-js/commit/a7d4c0da05f67cde05a99272b725a317c461d0e6"},{"type":"FIX","url":"https://github.com/DataDog/dd-trace-js/pull/8255"},{"type":"PACKAGE","url":"https://github.com/DataDog/dd-trace-js"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:16.084952788Z"}}