Incorrect Conversion between Numeric Types Affecting mongodb/mongo-c-driver package, versions [,4.5.2)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-MONGODBMONGOCDRIVER-20074881
- published24 Sept 2026
- disclosed3 Sept 2026
- creditUnknown
Introduced: 3 Sep 2026
CVE-2026-84966 (opens in a new tab)How to fix?
Upgrade mongodb/mongo-c-driver to version 4.5.2 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Conversion between Numeric Types in the builder process when handling NUL-embedded document keys. An attacker can cause the application to read memory outside the intended buffer and terminate the calling process by supplying an extremely large, non-terminated field name in a specific form. This is only exploitable if the calling application passes the oversized name in this specific form.