dd-trace-dotnet: Improper parsing of W3C baggage headers may lead to DoS

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-50273: 0.79% estimated exploitation activity in the next 30 days; percentile 56.40 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact Datadog tracing libraries that implement W3C baggage propagation parse incoming baggage HTTP headers without enforcing item-count or byte-size limits on the extract path. The DDTRACEBAGGAGEMAXITEMS (default 64) and DDTRACEBAGGAGEMAXBYTES (default 8192) limits were applied only to baggage injection, not extraction. A remote, unauthenticated attacker can send a request whose baggage header contains an arbitrarily large number of comma-separated key-value pairs (or a single very large value). The tracer allocates a hash-map entry for each pair on every request, causing unbounded CPU and memory consumption and enabling a remote Denial of Service against any HTTP service that has the baggage propagation style enabled. The baggage propagation style is enabled by default in most affected tracers, so any internet-facing service that has been instrumented with an affected tracer version is exposed unless the propagation style has been explicitly narrowed. Patches This is resolved in…

Published by the source

15 Jul 2026, 22:59 UTC

Last modified by the source

15 Jul 2026, 22:59 UTC

Source last checked

26 Oct 2026, 17:05 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-38wr-vpc7-2mp4

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# Patch Next advisory brief: CVE-2026-50273

Advisory: dd-trace-dotnet: Improper parsing of W3C baggage headers may lead to DoS
IDs: CVE-2026-50273, GHSA-38wr-vpc7-2mp4
Record: https://patchnext.com/advisories/cve-2026-50273 (revision 1, source checked 26 Oct 2026, 17:05 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: datadog.trace.opentracing 3.43.0; datadog.trace 3.43.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet datadog.trace.opentracing: affected < 3.43.0; fixed in 3.43.0
- NuGet datadog.trace: affected < 3.43.0; fixed in 3.43.0

## Suggested inspection (read-only)
- NuGet datadog.trace.opentracing: check the installed version with your package manager.
- NuGet datadog.trace: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on datadog.trace.opentracing, datadog.trace.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-38wr-vpc7-2mp4 (GitHub-reviewed advisory GHSA-38wr-vpc7-2mp4 lists affected ranges: NuGet datadog.trace >=0 =0 <3.43.0)

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