All vulnerabilities
CVE-2026-103965

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

MongoDB MongoDB ServerDatabases
Open in ThreatlineRecord JSON
CVSS
5.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.15%Chance of exploitation activity in the next 30 days, higher than 3% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in8.3.13Also 8.0.34, 7.0.45 and 1 moreCVE List
Published13 Oct 2026Updated 13 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from CVE List

Affected versions 4

  • MongoDB Serveraffected: 8.3.0 before 8.3.13CVE List
  • MongoDB Serveraffected: 8.0 before 8.0.34CVE List
  • MongoDB Serveraffected: 7.0 before 7.0.45CVE List
  • MongoDB Serveraffected: 9.0 before 9.0.4CVE List

References 1