{"id":"CVE-2026-50271","summary":"dd-trace-py: Improper parsing of W3C baggage headers may lead to DoS","details":"Datadog dd-trace-py is the Datadog Python APM client. Prior to 4.8.2, Datadog tracing libraries that implement W3C baggage propagation parse incoming baggage HTTP headers without enforcing DD_TRACE_BAGGAGE_MAX_ITEMS or DD_TRACE_BAGGAGE_MAX_BYTES limits on the extract path. 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, causing unbounded CPU and memory consumption and enabling a remote denial of service against HTTP services with baggage propagation enabled. This issue is fixed in version 4.8.2.","aliases":["GHSA-mw54-j2v2-42hr","PYSEC-2026-3461"],"modified":"2026-07-25T03:32:02.895470717Z","published":"2026-07-17T20:42:34.036Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50271.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-770"]},"references":[{"type":"WEB","url":"https://github.com/DataDog/dd-trace-py/releases/tag/v4.8.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50271.json"},{"type":"ADVISORY","url":"https://github.com/DataDog/dd-trace-py/security/advisories/GHSA-mw54-j2v2-42hr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50271"},{"type":"FIX","url":"https://github.com/DataDog/dd-trace-py/commit/9c80faa3dcfe238d008c3b3cd0b8e5dfef0aa4cd"},{"type":"FIX","url":"https://github.com/DataDog/dd-trace-py/pull/17926"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/datadog/dd-trace-py","events":[{"introduced":"0"},{"fixed":"9c80faa3dcfe238d008c3b3cd0b8e5dfef0aa4cd"},{"fixed":"58d0fd22d5d203637283843f8450bcdf64959fec"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"4.8.2"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v4.8.1","v4.8.0","v4.8.0rc5","v4.8.0rc4","v4.8.0rc2","v4.8.0rc3","v4.7.0rc4","v4.8.0rc1","v4.7.0rc3","v4.7.0rc2","v4.7.0rc1","v4.6.0rc3","v4.6.0rc2","v4.6.0rc1","v4.5.0rc2","v4.5.0rc1","v4.4.0rc3","v4.4.0rc2","v4.4.0rc1","v4.3.0rc1","v4.1.0rc1","v4.0.0rc1","v3.18.0rc2","v3.18.0","v3.18.0rc1","v3.17.0rc1","v3.17.0","v3.16.0rc2","v3.16.0","v3.15.0rc1","v3.15.0","v3.16.0rc1","v3.14.0rc2","v3.14.0","v3.14.0rc1","v3.13.0rc1","v3.12.0rc3","v3.12.0","v3.12.0rc2","v3.12.0rc1","v3.11.0rc3","v3.11.0","v3.11.0rc2","v3.11.0rc1","v3.10.0rc3","v3.10.0","v3.10.0rc2","v3.10.0rc1","v3.9.0rc2","v3.9.0","v3.9.0rc1","v3.8.0rc1","v3.7.0rc2","v3.7.0","v3.7.0rc1","v3.6.0rc1","v3.6.0","v3.5.1","v3.5.0rc1","v3.5.0","v3.4.0rc1","v3.3.0rc1","v3.2.0rc1","v3.2.0","v3.1.0rc1","v3.1.0","v3.0.0rc2","v3.0.0rc1","v2.20.0rc1","v2.20.0","v2.19.0rc1","v2.18.0rc1","v2.17.0rc1","v2.16.0rc1","v2.15.0rc1","v2.14.0rc1","v2.14.0","v2.13.0rc1","v2.12.0rc1","v2.11.0rc1","v2.10.0rc2","v2.10.0rc1","v2.9.0rc1","v2.8.0rc1","v2.7.0rc1","v2.6.0","v2.5.0rc1","v2.4.0rc1","v2.3.0","v2.3.0rc1","v2.2.0rc1","v2.2.0.pre","v2.0.0rc1","v1.20.0rc1","v1.20.0","v1.19.0rc1","v1.18.0rc1","v1.17.0rc1","v1.16.0rc1","v1.15.0rc1","v1.14.0rc1","v1.13.0rc1","v1.12.0rc1","v1.12.0","v1.11.0rc1","v1.11.0","v1.10.0rc2","v1.9.1","v1.10.0rc1","v1.9.0rc2","v1.9.0rc1","v1.8.0rc1","v1.7.0rc1","v1.6.0rc1","v1.5.0rc1","v1.4.0rc1","v1.3.0rc1","v1.2.0rc1","v1.1.0rc1","v0.59.0rc1","v0.58.0rc1","v0.57.0","v0.57.0rc3","v0.57.0rc2","v0.57.0rc1","v0.56.0rc3","v0.56.0rc2","v0.56.0rc1","v0.55.0rc1","v0.54.0rc1","v0.53.0rc1","v0.52.0rc1","v0.51.0rc2","v0.51.0rc1","v0.50.0rc5","v0.50.0rc4","v0.50.0rc3","v0.50.0rc2","v0.50.0rc1","v0.49.0rc1","v0.48.0rc1","v0.48.0rc2","v0.47.0rc1","v0.46.0rc1","v0.45.0rc1","v0.44.0rc1","v0.44.0","v0.43.0","v0.43.0rc1","v0.41.0","v0.42.0rc1","v0.38.0","v0.37.0","v0.36.0","v0.35.0","v0.34.0","v0.33.0","v0.31.0","v0.30.0","v0.29.0","v0.28.0","v0.27.0","v0.26.0","v0.25.0","v0.24.0","v0.23.0","v0.22.0","v0.21.1","v0.21.0","v0.20.4","v0.20.3","v0.20.2","v0.20.1","v0.20.0","v0.19.0","v0.18.0","v0.17.1","v0.17.0","v0.16.0","v0.15.0","v0.14.1","v0.14.0","v0.13.1","v0.13.0","v0.12.1","v0.12.0","v0.11.1","v0.11.0","v0.10.1","v0.10.0","v0.9.2","v0.9.1","v0.9.0","v0.8.5","v0.8.4","v0.8.3","v0.8.2","v0.8.1","v0.8.0","v0.7.0","v0.6.0","v0.5.5","v0.5.4","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.4.0","v0.3.16","v0.3.15","v0.3.14","0.3.14","v0.3.13","v0.3.12","v0.3.11","v0.3.10","v0.3.9","v0.3.8","v0.3.7","v0.3.6","v0.3.5","v0.3.4","v0.3.3","v0.3.2","v0.3.1","v0.3.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-50271.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:H"}]}