CVE-2026-6914: mongodb Integer Underflow — Fix

Description

Computing the MD5 checksum of a malformed BSON object under specific conditions may cause loss of availability in MongoDB server. This issue affects all MongoDB Server v8.2 versions, all MongoDB Server v8.1 versions, MongoDB Server v8.0 versions prior to 8.0.21, MongoDB Server v7.0 versions prior to 7.0.32

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0004

Probability of exploitation

0.13%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-191 CWE-191

Affected Products

Vendor	Product	Versions
mongodb	mongodb	7.0.0 — 7.0.32
mongodb	mongodb	8.0.0 — 8.0.21
mongodb	mongodb	8.1.0 — 8.2.7

References

Advisories & Patches

https://jira.mongodb.org/browse/SERVER-119981

Frequently Asked Questions

What is CVE-2026-6914? +

Computing the MD5 checksum of a malformed BSON object under specific conditions may cause loss of availability in MongoDB server. This issue affects all MongoDB Server v8.2 versions, all MongoDB Server v8.1 versions, MongoDB Server v8.0 versions prior to 8.0.21, MongoDB Server v7.0 versions prior to 7.0.32 It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-6914? +

CVE-2026-6914 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0004, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-6914? +

CVE-2026-6914 affects products from mongodb, specifically: mongodb. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-6914? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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