CVE-2026-18688: 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…

PriorityP335high7.1CVSS 3.1

AVNACLPRLUINSUCLINAH

EPSS

0.40%

33.0th percentile

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.

Affected

10 ranges

Vendor	Product	Version range	Fixed in
mongodb	mongodb	—	—
mongodb	mongodb	—	—
mongodb	mongodb	—	—
mongodb	mongodb	>= 7.0.0 < 7.0.40	7.0.40
mongodb	mongodb	>= 8.0.0 < 8.0.29	8.0.29
mongodb	mongodb	8.2.0 – 8.2.12	—
mongodb	mongodb	>= 8.3.0 < 8.3.8	8.3.8
mongodb	mongodb_server	>= 7.0 < 7.0.40	7.0.40
mongodb	mongodb_server	>= 8.0 < 8.0.29	8.0.29
mongodb	mongodb_server	>= 8.3.0 < 8.3.8	8.3.8

CVSS provenance

nvdv3.17.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H

nvdv4.07.1HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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