Vulnerability · Published Jul 17, 2026 · Assigned by GitHub_M
CVE-2026-50271dd-trace-py: Improper parsing of W3C baggage headers may lead to DoS
High 7.5
In plain English
A high-severity resource allocation without limits in dd-trace-py from DataDog. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Datadog dd-trace-py is the Datadog Python APM client. Prior to 4.8.2, Datadog tracing libraries that implement W3C baggage propagation parse incoming baggage HTTP headers without enforcing DD_TRACE_BAGGAGE_MAX_ITEMS or DD_TRACE_BAGGAGE_MAX_BYTES limits on the extract path. 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, causing unbounded CPU and memory consumption and enabling a remote denial of service against HTTP services with baggage propagation enabled. This issue is fixed in version 4.8.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | ddtrace | 4.8.2 | GHSA-mw54-j2v2-42hr |
| PyPI | ddtrace | 4.8.2 | PYSEC-2026-3461 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| DataDog | dd-trace-py | < 4.8.2 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/DataDog/dd-trace-py/security/advisories/GHSA-mw54-j2v2-42hr x_refsource_CONFIRM
- https://github.com/DataDog/dd-trace-py/pull/17926 x_refsource_MISC
- https://github.com/DataDog/dd-trace-py/commit/9c80faa3dcfe238d008c3b3cd0b8e5dfef0aa4cd x_refsource_MISC
- https://github.com/DataDog/dd-trace-py/releases/tag/v4.8.2 x_refsource_MISC