What’s Vulnerable › Vulnerabilities
CVE-2026-106429: Application denial of service via malformed KMS endpoint in MongoDB libmongocrypt
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-08 · updated 2026-10-08
- Weakness: CWE-191
Description
An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.
Affected products
- MongoDB libmongocrypt: from 1.1.0 before 1.20.5 — fixed in 1.20.5
How to fix
Upgrade to a fixed version: MongoDB libmongocrypt 1.20.5. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-106429 or the next vulnerability affects your stack