6.2

CVE-2026-106437: mongodb c_driver Integer Underflow (Wrap or Wraparound)

CVSS: 6.2v3.1MediumAwaiting analysis
AliasesDEBIAN-CVE-2026-106437UBUNTU-CVE-2026-106437
Published 08-10-2026Last modified 08-10-2026
Open JSON

Vulnerability summary

CVE-2026-106437 is a medium (CVSS 6.2) Integer Underflow (Wrap or Wraparound) vulnerability in mongodb c_driver. EPSS estimates a 0.10% chance of exploitation in the next 30 days, higher than 0.6% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.2/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.10%
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

The BSON buffer-reservation API in the MongoDB C Driver can record a length smaller than the five-byte BSON minimum. Later append or comparison operations can underflow unsigned length calculations and read or write outside the document buffer. An actor who can influence the length supplied by an embedding application can cause the application to terminate or read or corrupt adjacent process memory. Reaching this issue requires the application to pass an undersized value to bson_reserve_buffer and then perform an affected operation.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.10%

Chance of exploitation in the next 30 days

Percentile

1%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

09-10-202619-10-2026
EPSS score
0.10%

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