Quick answers
- Is CVE-2026-120956 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-120956 being exploited in the wild.
- How severe is CVE-2026-120956?
- High severity, with a CVSS score of 7.1, published 3 November 2026.
- Which products and versions are affected?
- MongoDB C Driver.
- Is there a fix for CVE-2026-120956?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-120956 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-120956?
- Check whether you run MongoDB C Driver. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The MongoDB C Driver does not validate the type or format of the namespace field returned by a server in query responses. An unauthenticated MongoDB endpoint can return a malformed value in this field, triggering a buffer over-read and causing the client process to crash, while also potentially leaking uninitialized heap memory in a follow-up command to the endpoint.
Affected products
- MongoDB C Driver
Timeline
- 2026-11-03: disclosed