Vulnerability · Published Sep 17, 2026 · Assigned by GitHub_M
CVE-2026-50275Datadog PHP Tracer: 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-php from DataDog. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).
Official description
The Datadog PHP Tracer provides application performance monitoring and distributed tracing for PHP. Prior to 1.19.2, ddtrace_deserialize_baggage in ext/distributed_tracing_headers.c parses incoming W3C baggage HTTP headers without enforcing DD_TRACE_BAGGAGE_MAX_ITEMS or DD_TRACE_BAGGAGE_MAX_BYTES. A remote unauthenticated client can send an arbitrarily large number of comma-separated key-value pairs or a single oversized value, causing the tracer to allocate hash-map entries and consume unbounded CPU and memory on each request. Baggage extraction is enabled by default in most affected deployments unless baggage is removed from DD_TRACE_PROPAGATION_STYLE or DD_TRACE_PROPAGATION_STYLE_EXTRACT. This issue is fixed in version 1.19.2.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| DataDog | dd-trace-php | < 1.19.2 |
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-php/security/advisories/GHSA-phwx-ww2p-cv9v x_refsource_CONFIRM
- https://github.com/DataDog/dd-trace-php/pull/3854 x_refsource_MISC
- https://github.com/DataDog/dd-trace-php/commit/2f7987eb02e306bb62bce8ec4152dece68112f51 x_refsource_MISC
- https://github.com/DataDog/dd-trace-php/commit/43072ccafe55a5dbdfba75a42bf316b4150ae1e5 x_refsource_MISC
- https://github.com/DataDog/dd-trace-php/releases/tag/1.19.2 x_refsource_MISC
- https://github.com/DataDog/dd-trace-php/releases/tag/1.20.0 x_refsource_MISC