Vulnerability in MongoDB
CVE-2026-5170
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (24.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- MongoDB
- MongoDB Server — versions 8.2, 8.0, 7.0
Weakness classification (CWE)
References
- jira.mongodb.org/browse/SERVER-101758 (vendor-advisory, Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-5170?
- CVE-2026-5170 is a medium-severity vulnerability in MongoDB, classified under Reachable Assertion. CVSS score: 5.3/10. Published 2026-03-30.
- How severe is CVE-2026-5170?
- Medium severity. CVSS v3 base score is 5.3 out of 10.