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

> CVE-2026-50271: dd-trace-py: Improper parsing of W3C baggage headers may lead to DoS. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-50271
Last updated: 2026-10-24T20:10:00Z

- Published: 2026-07-17 20:42 UTC · Updated: 2026-10-24 20:10 UTC · Assigner: GitHub\_M
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.79%, 56th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: 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 vendors and products

- DataDog: dd-trace-py

## Tracked companies

- [Datadog](https://rewindex.com/company/datadog.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-50271)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-50271)
- [https://github.com/DataDog/dd-trace-py/commit/9c80faa3dcfe238d008c3b3cd0b8e5dfef0aa4cd](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/pull/17926)
- [https://github.com/DataDog/dd-trace-py/releases/tag/v4.8.2](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](https://github.com/DataDog/dd-trace-py/security/advisories/GHSA-mw54-j2v2-42hr)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-50271 · Markdown: https://rewindex.com/cve/CVE-2026-50271.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-50271 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:13:30.692Z