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Medium severity · published Mar 30, 2026
CVE-2026-5170
Users could trigger a crash of mongod primaries during promotion to sharded
5.3
CVSS
0.2%
EPSS
No
On KEV
Description
A user with access to the cluster with a limited set of privilege actions can trigger a crash of a mongod process during the limited and unpredictable window when the cluster is being promoted from a replica set to a sharded cluster. This may cause a denial of service by taking down the primary of the replica set. This issue affects MongoDB Server v8.2 versions prior to 8.2.2, MongoDB Server v8.0 versions between 8.0.18, MongoDB Server v7.0 versions between 7.0.31.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
High
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 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
MongoDB · MongoDB
8.2 before 8.2.2; 8.0 before 8.0.18; 7.0 before 7.0.31 · source: vendor, NVD
Affected product
MO
MongoDB
MongoDB
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5170
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5170
Patch
https://jira.mongodb.org/browse/SERVER-101758
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