Use After Free in MongoDB
CVE-2026-4148
A use-after-free vulnerability can be triggered in sharded clusters by an authenticated user with the read role who issues a specially crafted $lookup or $graphLookup aggregation pipeline.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (43.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- MongoDB — versions 8.3.0
- MongoDB Inc Server — versions 8.2, 8.0, 7.0
Weakness classification (CWE)
References
- jira.mongodb.org/browse/SERVER-119319 (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-4148?
- CVE-2026-4148 is a high-severity vulnerability in MongoDB, classified under Use After Free. CVSS score: 8.8/10. Published 2026-03-17.
- How severe is CVE-2026-4148?
- High severity. CVSS v3 base score is 8.8 out of 10.