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Vulnerability record · CVE-2026-50275 · published 17 September 2026

CVE-2026-50275: Allocation without limits vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.68% · top 49.4% CWE-770 · Allocation without limits Awaiting Analysis
7.5CVSS 3.1 base score
0.68%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
23 Sep 2026Last modified by NVD

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.

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

References

LinkTags
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/pull/3854
https://github.com/DataDog/dd-trace-php/releases/tag/1.19.2
https://github.com/DataDog/dd-trace-php/releases/tag/1.20.0
https://github.com/DataDog/dd-trace-php/security/advisories/GHSA-phwx-ww2p-cv9v

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Source: NIST National Vulnerability Database (record CVE-2026-50275), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.