Low severity · published Oct 8, 2026
CVE-2026-106438
Silent Decimal128 value corruption via incorrect exactness check in MongoDB C Driver
3.7
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 1% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
MongoDB · MongoDB
1.4.0 before 1.30.13; 2.0.0 before 2.5.6 · source: vendor
CD
C Driver · Mongodb
1.4.0 before 1.30.13; 2.0.0 before 2.5.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-106438
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-106438
jira.mongodb.org
https://jira.mongodb.org/browse/CDRIVER-6419
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