CVE-2026-103965

Fixed values in MongoDB Server $bucket stage may be misread as field references

CVE-2026-103965 is fixed in MongoDB on 1 platform by MongoDB 9.0.4 (version 9.0.4), released October 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

5.3

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0015

4th percentile

An issue in MongoDB Server's aggregation framework can cause certain constant values to be handled incorrectly during internal query rewriting. Under certain conditions, an authenticated user with read access may receive field values in aggregation output that the query did not intend to return.

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
MongoDB	9.0.4	MongoDB 9.0.4	Oct 8, 2026

Details

Published
October 13, 2026
Weakness
CWE-94: Improper Control of Generation of Code ('Code Injection')
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-103965

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