What’s Vulnerable › Vulnerabilities
CVE-2026-106438: Silent Decimal128 value corruption via incorrect exactness check in MongoDB C Driver
- Severity: low (CVSS 3.7 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-08 · updated 2026-10-27
- Weakness: CWE-682
Description
An incorrect calculation in Decimal128 string parsing in the MongoDB C Driver can accept certain over-precision inputs containing leading zeros instead of rejecting them. This produces a value different from the supplied text. An actor who can provide a decimal string to an embedding application, including through Extended JSON parsing, can cause the application to store or use an incorrect numeric value.
Affected products
- MongoDB C# Driver: from 1.4.0 before 1.30.13; from 2.0.0 before 2.5.6 — fixed in 1.30.13, 2.5.6
- MongoDB C# Driver: from 1.4.0 before 1.30.13; from 2.0.0 before 2.5.6 — fixed in 1.30.13, 2.5.6
How to fix
Upgrade to a fixed version: MongoDB C# Driver 1.30.13, 2.5.6; MongoDB C# Driver 1.30.13, 2.5.6. Check the vendor advisory for mitigations.
References
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