What is CVE-2026-1849?

CVE-2026-1849 is a medium-severity vulnerability in MongoDB, classified under Uncontrolled Recursion. CVSS score: 6.5/10. Published 2026-02-10.

How severe is CVE-2026-1849?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in MongoDB

CVE-2026-1849

MongoDB Server may experience an out-of-memory failure while evaluating expressions that produce deeply nested documents. The issue arises in recursive functions because the server does not periodically check the depth of the expression.

Published 2026-02-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (19.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.4% 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: 0.003 · change: +0.000

Affected products

MongoDB
MongoDB Inc Server — versions 8.0, 7.0, 8.2

Weakness classification (CWE)

CWE-674 — Uncontrolled Recursion

References

jira.mongodb.org/browse/SERVER-102364 (Vendor Advisory)

Frequently asked questions

What is CVE-2026-1849?: CVE-2026-1849 is a medium-severity vulnerability in MongoDB, classified under Uncontrolled Recursion. CVSS score: 6.5/10. Published 2026-02-10.
How severe is CVE-2026-1849?: Medium severity. CVSS v3 base score is 6.5 out of 10.