Datadog PHP Tracer: Improper parsing of W3C baggage headers may lead to DoS
cve-program · CVE-2026-50275
PublishedThe 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.
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CVE-2026-50275 · CVE overview and exploitation status
cve-program · CVE-2026-50275
- 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
Related changes
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