CVE-2026-50271 json
dd-trace-py: Improper parsing of W3C baggage headers may lead to DoS
published 2026-07-15 3 mo ago modified 2026-10-24 15 d ago also GHSA-mw54-j2v2-42hr , PYSEC-2026-3461 , EUVD-2026-45329
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 56%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi ddtrace 4.8.2
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | ddtrace | <4.8.2 |
4.8.2 |
Affected products
- DataDog dd-trace-py
Classification
References
- github.com /DataDog/dd-trace-py/pull/17926
- github.com /DataDog/dd-trace-py/commit/9c80faa3dcfe238d008c3b3cd0b8e5dfef0aa4cd
-
github.com
/DataDog/dd-trace-py/security/advisories/GHSA-mw54-j2v2-42hr
web
- github.com /DataDog/dd-trace-py/releases/tag/v4.8.2
-
github.com
/DataDog/dd-trace-py
package
-
pypi.org
/project/ddtrace
package
-
github.com
/advisories/GHSA-mw54-j2v2-42hr
advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-50271
advisory
Sources
- CVE List CVE-2026-50271
- GitHub Advisory GHSA-mw54-j2v2-42hr
- NVD CVE-2026-50271
- OSV PYSEC-2026-3461
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.