Medium severity · published Oct 13, 2026
CVE-2026-104004
Collection validators using collation-accepting expressions can crash MongoDB Server on insert
6.5
CVSS
0.2%
EPSS
No
On KEV
Description
MongoDB Server's collection validation feature may not properly handle certain expressions stored in a validator. In some cases, this can cause the server process to stop running when a document is later inserted. The behavior can occur for authenticated users with write access.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
MongoDB · MongoDB
8.3.0 before 8.3.13; 8.0 before 8.0.34; 9.0 before 9.0.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-104004
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-104004
jira.mongodb.org
https://jira.mongodb.org/browse/SERVER-131412
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