CVE-2026-1849

Mongod can run out of stack memory when expressions create deeply nested documents

CVE-2026-1849 is fixed in MongoDB on 1 platform by MongoDB 8.0.18 (version 8.0.18), released January 15, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.1

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0033

25th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
MongoDB	8.0.18	MongoDB 8.0.18	Jan 15, 2026

Details

Published
February 10, 2026
Weakness
CWE-674: Uncontrolled Recursion
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-1849

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