What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-17 · updated 2026-10-24
• Weakness: CWE-770

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 products

• DataDog dd-trace-py: before 4.8.2

References

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

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