7.1

CVE-2026-106429: mongodb libmongocrypt Integer Underflow (Wrap or Wraparound)

CVSS: 7.1v4.0HighAwaiting analysis
AliasesDEBIAN-CVE-2026-106429UBUNTU-CVE-2026-106429
Published 08-10-2026Last modified 08-10-2026
Open JSON

Vulnerability summary

CVE-2026-106429 is a high (CVSS 7.1) Integer Underflow (Wrap or Wraparound) vulnerability in mongodb libmongocrypt. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 20.2% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v4.0 (CVE.org)
EPSS score
0.29%
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 integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

09-10-202620-10-2026
EPSS score
0.29%

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
  • libmongocryptAll versions (No fix recorded) | < 1.20.5-1
Mongodb1 product
Ubuntu1 product
  • libmongocryptAll versions (No fix recorded)

3 vendors · 3 products

References

4 links