CVE-2026-50277: dd-trace-cpp: Improper parsing of W3C baggage headers may lead to DoS
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.
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · CWE-770
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
DataDog: dd-trace-cpp
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- github.com/DataDog/dd-trace-cpp/commit/422dc91bb93e358e3977381275d311f3f926d666 (opens in new tab)
- github.com/DataDog/dd-trace-cpp/pull/313 (opens in new tab)
- github.com/DataDog/dd-trace-cpp/releases/tag/v2.1.0 (opens in new tab)
- github.com/DataDog/dd-trace-cpp/security/advisories/GHSA-ch7h-phmx-rqwq (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)