5.1

CVE-2026-106438: mongodb c_driver Incorrect Calculation

CVSS: 5.1v4.0MediumAwaiting analysis
AliasesDEBIAN-CVE-2026-106438UBUNTU-CVE-2026-106438
Published 08-10-2026Last modified 08-10-2026
Open JSON

Vulnerability summary

CVE-2026-106438 is a medium (CVSS 5.1) Incorrect Calculation vulnerability in mongodb c_driver. EPSS estimates a 0.11% chance of exploitation in the next 30 days, higher than 1.1% of scored vulnerabilities.

Overall risk
20/100
0100
Low · default modelHow is this calculated?
CVSS score
5.1/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.11%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 08-10-2026
    PublishedVulnerability first disclosed.
  2. 08-10-2026
    Last modifiedVulnerability information updated.

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 metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.11%

Chance of exploitation in the next 30 days

Percentile

1%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

09-10-202620-10-2026
EPSS score
0.11%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • mongo-c-driverAll versions (No fix recorded) | < 2.5.6-1
Mongodb1 product
  • c_driver≥ 1.4.0, < 1.30.13 | ≥ 2.0.0, < 2.5.6
Ubuntu1 product
  • mongo-c-driverAll versions (No fix recorded)

3 vendors · 3 products

References

4 links