Vulnerability · Published Mar 30, 2026 · Assigned by mongodb

CVE-2026-5170Users could trigger a crash of mongod primaries during promotion to sharded

Medium 5.3

In plain English

A medium-severity security flaw in MongoDB Server from MongoDB. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.2%top 88.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
MongoDB	MongoDB Server	8.2 – before 8.2.28.0 – before 8.0.187.0 – before 7.0.31

Weakness: CWE-617 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

References

https://jira.mongodb.org/browse/SERVER-101758 vendor-advisory