Out-of-bounds Write Affecting mongodb/mongo-c-driver package, versions [1.30.0,1.30.9)[2.0.0,2.5.2)
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-20074887
- published24 Sept 2026
- disclosed3 Sept 2026
- creditUnknown
Introduced: 3 Sep 2026
CVE-2026-84969 (opens in a new tab)How to fix?
Upgrade mongodb/mongo-c-driver to version 1.30.9, 2.5.2 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Write in the BSON-to-JSON conversion process when a binary field is encoded and the output is truncated at a specified length limit. An attacker can alter a small amount of data outside the intended buffer by supplying crafted document content.