Quick answers
- Is CVE-2026-118581 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-118581 being exploited in the wild.
- How severe is CVE-2026-118581?
- Medium severity, with a CVSS score of 6.5, published 28 October 2026.
- Which products and versions are affected?
- MongoDB Java Driver before 5.14.0.
- Is there a fix for CVE-2026-118581?
- Yes: fixed in 5.14.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-118581 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-118581?
- Check whether you run MongoDB Java Driver at an affected version. 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.
How to fix
- Fixed in: 5.14.0
Technical details
The vulnerability exists in the BSON encoding component (BsonBinaryWriter) which does not verify that an externally supplied raw document's self-declared length agrees with the byte range provided. When a RawBsonDocument wrapping untrusted bytes is used in a command, the size mismatch allows attacker-controlled trailing content to be interpreted as additional fields by the database, resulting in command injection. This is a logic bug in size validation with network-based attack vector that requires only the ability to influence the bytes within the victim application.
Affected products
- MongoDB Java Driver before 5.14.0
Timeline
- 2026-10-28: disclosed
- 2026-10-28: patched