7.5

CVE-2026-6231: mongodb inc. c driver Improper Input Validation

CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-6231DEBIAN-CVE-2026-6231
Published 13-04-2026Last modified 13-04-2026
Open JSON

Vulnerability summary

CVE-2026-6231 is a high (CVSS 7.5) Improper Input Validation vulnerability in mongodb inc. c driver. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 23% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.32%
0%100%
Low · +0.13 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 13-04-2026
    PublishedVulnerability first disclosed.
  2. 13-04-2026
    Last modifiedVulnerability information updated.

Description

The bson_validate function may return early on specific inputs and incorrectly report success. This behavior could result in skipping validation for BSON data, allowing malformed or invalid UTF-8 sequences to bypass validation and be processed incorrectly. The issue may affect applications that rely on these functions to validate untrusted BSON data before further processing. This issue affects MongoDB C Driver versions prior to 1.30.5, MongoDB C Driver version 2.0.0 and MongoDB C Driver version 2.0.1

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.32%

Chance of exploitation in the next 30 days

Percentile

23%

Versus all other CVEs

30-day change

+0.13 pp

From 0.18% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.32%

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-driver< 1.23.1-1+deb12u3 | < 1.30.4-1+deb13u2 | < 2.1.0-1
Mongodb1 product
Mongodb inc.1 product
  • c driver≥ 1.0, < 1.30.5 | ≥ 2.0, < 2.0.2
Ubuntu1 product
  • mongo-c-driverAll versions (No fix recorded)

4 vendors · 4 products

References

4 links