Datadog PHP Tracer: Improper parsing of W3C baggage headers may lead to DoS

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-50275
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 21:17:14 UTC
Updated2026-09-18 20:17:16 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.004850000 probability, percentile 0.407420000 (date 2026-09-21)

Problem Types: CWE-770 | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA DataDog Dd-trace-php affected < 1.19.2 Not specified

References

ReferenceSourceLinkTags
github.com/DataDog/dd-trace-php/commit/2f7987eb02e306bb62bce8ec4152dece6... [email protected] github.com
github.com/DataDog/dd-trace-php/security/advisories/GHSA-phwx-ww2p-cv9v [email protected] github.com
github.com/DataDog/dd-trace-php/releases/tag/1.20.0 [email protected] github.com
github.com/DataDog/dd-trace-php/commit/43072ccafe55a5dbdfba75a42bf316b41... [email protected] github.com
github.com/DataDog/dd-trace-php/pull/3854 [email protected] github.com
github.com/DataDog/dd-trace-php/releases/tag/1.19.2 [email protected] github.com
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