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CVE-2026-18688

HighCVSS 7.1/10Last modified Oct 23, 2026

Description

An issue in MongoDB Server's aggregation framework could allow an authenticated user to trigger an out-of-bounds memory read by providing a specially formed numeric parameter in a certain aggregation pipeline stage. This could result in a server crash (denial of service) and may potentially expose a limited amount of memory contents.

Metrics

CVSS 3.1 7.1/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
MongoDB	MongoDB Server	>= 8.3.0, < 8.3.8; >= 8.0, < 8.0.29; >= 7.0, < 7.0.40

References

https://jira.mongodb.org/browse/SERVER-129617Vendor Advisory, Issue Tracking

Timeline

Published: Aug 11, 2026
Last modified: Oct 23, 2026
NVD status: Analyzed

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CVE-2026-18688: High severity, CVSS 7.1 | Vulnix