CVE-2026-50271

HIGH 7.5

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

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-770
Vendor	datadog
Product	dd-trace-py
Published	Jul 17, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

DataDog / dd-trace-py

< 4.8.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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