# CVE-2026-50275: Datadog PHP Tracer: Improper parsing of W3C baggage headers may lead to DoS

> CVE-2026-50275: Datadog PHP Tracer: Improper parsing of W3C baggage headers may lead to DoS. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-50275
Last updated: 2026-09-23T18:12:04Z

- Published: 2026-09-17 20:04 UTC · Updated: 2026-09-23 18:12 UTC · Assigner: GitHub\_M
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.68%, 52th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-770

## 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 vendors and products

- DataDog: dd-trace-php

## Tracked companies

- [Datadog](https://rewindex.com/company/datadog.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-50275)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-50275)
- [https://github.com/DataDog/dd-trace-php/commit/2f7987eb02e306bb62bce8ec4152dece68112f51](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/commit/43072ccafe55a5dbdfba75a42bf316b4150ae1e5)
- [https://github.com/DataDog/dd-trace-php/pull/3854](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/1.19.2)
- [https://github.com/DataDog/dd-trace-php/releases/tag/1.20.0](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](https://github.com/DataDog/dd-trace-php/security/advisories/GHSA-phwx-ww2p-cv9v)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-50275 · Markdown: https://rewindex.com/cve/CVE-2026-50275.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-50275 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:02.651Z