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High severityNVD Advisory· Published Jul 17, 2026· Updated Jul 20, 2026

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

CVE-2026-50271

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.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
ddtracePyPI
< 4.8.24.8.2

Affected products

23

Patches

Vulnerability mechanics

References

5

News mentions

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