# CVE-2026-50277: dd-trace-cpp: Improper parsing of W3C baggage headers may lead to DoS

> CVE-2026-50277: dd-trace-cpp: Improper parsing of W3C baggage headers may lead to DoS. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-50277
Last updated: 2026-09-24T21:16:28Z

- Published: 2026-09-17 20:16 UTC · Updated: 2026-09-24 21:16 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

dd-trace-cpp is the Datadog distributed tracing library for C++. Prior to 2.1.0, dd-trace-cpp parses incoming W3C baggage headers without enforcing DD\_TRACE\_BAGGAGE\_MAX\_ITEMS or DD\_TRACE\_BAGGAGE\_MAX\_BYTES on the extraction path, even though those limits are enforced during injection. A remote unauthenticated attacker can send a header containing many comma-separated key-value pairs or one very large value, causing per-request hash-map allocation and unbounded CPU and memory consumption. Baggage extraction is enabled by default in most affected tracers unless baggage is removed from DD\_TRACE\_PROPAGATION\_STYLE or DD\_TRACE\_PROPAGATION\_STYLE\_EXTRACT, so affected internet-facing services can be denied service. This issue is fixed in version 2.1.0.

## Affected vendors and products

- DataDog: dd-trace-cpp

## Tracked companies

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

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-50277)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-50277)
- [https://github.com/DataDog/dd-trace-cpp/commit/422dc91bb93e358e3977381275d311f3f926d666](https://github.com/DataDog/dd-trace-cpp/commit/422dc91bb93e358e3977381275d311f3f926d666)
- [https://github.com/DataDog/dd-trace-cpp/pull/313](https://github.com/DataDog/dd-trace-cpp/pull/313)
- [https://github.com/DataDog/dd-trace-cpp/releases/tag/v2.1.0](https://github.com/DataDog/dd-trace-cpp/releases/tag/v2.1.0)
- [https://github.com/DataDog/dd-trace-cpp/security/advisories/GHSA-ch7h-phmx-rqwq](https://github.com/DataDog/dd-trace-cpp/security/advisories/GHSA-ch7h-phmx-rqwq)

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_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/)_


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Canonical: https://rewindex.com/cve/CVE-2026-50277 · Markdown: https://rewindex.com/cve/CVE-2026-50277.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-50277 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:16.247Z