CVE-2026-106438
Medium
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.
SeverityMedium
CVSS4.0
Exploit probability3. percentile0.1%
Product
Mongodb C Driver
PublishedOct 8, 2026
First seenOct 8, 2026
Weakness typeCWE-682CWE-682
How to fix
Update
- mongodb c_driver1.30.13, 2.5.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mongodb c_driver | 1.4.0 ≤ v < 1.30.13, 2.0.0 ≤ v < 2.5.6 | 1.30.13, 2.5.6 |
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