CVE-2026-50271: dd-trace-py: Improper parsing of W3C baggage headers may lead to DoS
Description
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.
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · CWE-770
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
DataDog: dd-trace-py
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- github.com/DataDog/dd-trace-py/commit/9c80faa3dcfe238d008c3b3cd0b8e5dfef0aa4cd (opens in new tab)
- github.com/DataDog/dd-trace-py/pull/17926 (opens in new tab)
- github.com/DataDog/dd-trace-py/releases/tag/v4.8.2 (opens in new tab)
- github.com/DataDog/dd-trace-py/security/advisories/GHSA-mw54-j2v2-42hr (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)