CVE-2026-106437
MEDIUMDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 1% of all known CVEs.
References
Related Vulnerabilities
Other CWE-191 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2014-0497 | Critical | 9.8 | 100% | KEV | Fix |
| CVE-2020-36228 | High | 7.5 | 85% | - | Fix |
| CVE-2020-36221 | High | 7.5 | 85% | - | Fix |
| CVE-2024-38063 | Critical | 9.8 | 71% | - | Fix |
| CVE-2017-14496 | High | 7.5 | 66% | - | Fix |
| CVE-2004-0184 | Medium | 5.0 | 60% | - | Fix |
Common questions
How do I fix CVE-2026-106437?
Upgrade mongo-c-driver on debian unstable to 2.5.6-1 or later.
Is CVE-2026-106437 being actively exploited?
Not that we know of. CVE-2026-106437 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.10% is the estimated probability that it will be exploited in the next 30 days. That is higher than 1% of all scored CVEs.
How severe is CVE-2026-106437?
CVE-2026-106437 has a CVSS v3 base score of 6.2, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-106437 affect?
Published advisories record a fix for mongo-c-driver (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-08.