Vulnerability · Published Sep 17, 2026 · Assigned by GitHub_M

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

High 7.5

In plain English

A high-severity resource allocation without limits in dd-trace-cpp from DataDog. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.8%top 43.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 products (as reported)

Vendor	Product	Versions
DataDog	dd-trace-cpp	< 2.1.0

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/DataDog/dd-trace-cpp/security/advisories/GHSA-ch7h-phmx-rqwq x_refsource_CONFIRM
https://github.com/DataDog/dd-trace-cpp/pull/313 x_refsource_MISC
https://github.com/DataDog/dd-trace-cpp/commit/422dc91bb93e358e3977381275d311f3f926d666 x_refsource_MISC
https://github.com/DataDog/dd-trace-cpp/releases/tag/v2.1.0 x_refsource_MISC