CVE-2026-50275
Datadog PHP Tracer: Improper parsing of W3C baggage headers may lead to DoS
- State
- Published
- Severity
- 7.5 High
- Published
- Sep 17, 2026
- Updated
- Sep 18, 2026
- Reserved
- Jun 4, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | GitHub_M |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
dd-trace-phpDataDog |
|
References
- https://github.com/DataDog/dd-trace-php/security/advisories/GHSA-phwx-ww2p-cv9v
- https://github.com/DataDog/dd-trace-php/pull/3854
- https://github.com/DataDog/dd-trace-php/commit/2f7987eb02e306bb62bce8ec4152dece68112f51
- https://github.com/DataDog/dd-trace-php/commit/43072ccafe55a5dbdfba75a42bf316b4150ae1e5
- https://github.com/DataDog/dd-trace-php/releases/tag/1.19.2
- https://github.com/DataDog/dd-trace-php/releases/tag/1.20.0
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