High 7.5Published Jul 17, 2026

CVE-2026-50271dd-trace-py: Improper parsing of W3C baggage headers may lead to DoS

Updated under an hour ago (Oct 26, 2026, 5:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for DataDog dd-trace-py

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Jul 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

DataDog dd-trace-py datadog:dd_trace_py (from the name)	before 4.8.2	CNA record

References

References

https://github.com/DataDog/dd-trace-py/security/advisories/GHSA-mw54-j2v2-42hr	x-refsource-confirm
https://github.com/DataDog/dd-trace-py/pull/17926	x-refsource-misc
https://github.com/DataDog/dd-trace-py/commit/9c80faa3dcfe238d008c3b3cd0b8e5dfef0aa4cd	x-refsource-misc
https://github.com/DataDog/dd-trace-py/releases/tag/v4.8.2	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.