Improper Input Validation in MongoDB Aggregation Command Handling Leads to Denial of Service

published 2026-08-11 2 mo ago modified 2026-10-01 38 d ago also BIT-mongodb-2026-18707 , EUVD-2026-56862

cvss: 4.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits: 0; none known

An issue in MongoDB Server could allow an authenticated user, including one with no assigned privileges, to cause the server process to terminate unexpectedly by submitting a specially formed aggregation command. This could result in a denial of service.

Patch / fix

fixed in 2

bitnami mongodb 7.0.40, 8.0.29, 8.3.8, 9.0.2
MongoDB MongoDB Server 8.3.8

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 mo ago (2026-08-11)

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	5.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CNA	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CNA	4.0	5.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/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

Affected packages

ecosystem	package	affected	fixed in
bitnami	mongodb	>=7.0.0, <7.0.40 >=8.0.0, <8.0.29 >=8.2.0, <8.3.8 >=9.0.0, <9.0.2	7.0.40 8.0.29 8.3.8 9.0.2

Affected products

MongoDB MongoDB Server

Classification

Weakness

CWE-617 Reachable Assertion

Technology feeds

MongoDB rss critical rss

References

jira.mongodb.org /browse/SERVER-128482
vendor-advisory, issue-tracking, advisory
nvd.nist.gov /vuln/detail/CVE-2026-18707
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary