Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The ddtrace package (Datadog tracing library for Python) versions before 4.8.2 parse incoming W3C baggage headers without enforcing item-count or byte-size limits during extraction. A remote, unauthenticated attacker can send a request with an oversized baggage header, causing unbounded CPU and memory use and a denial of service in HTTP services where baggage propagation is enabled, which is the default. Upgrade to ddtrace 4.8.2 or later. Alternatively, remove baggage from the propagation style settings or cap HTTP request header size at an upstream proxy or web server.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.5 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0079, the 56th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:35 UTC First seen by agentprime
- 31 Oct 2026, 14:35 UTC Confirmed by OSV