CVE-2026-103965 PUBLISHED

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

Assigner: mongodb
Reserved: 01.10.2026 Published: 13.10.2026 Updated: 13.10.2026

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.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS Score: 5.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS Score: 5.4

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	Low
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	MongoDB
Product	MongoDB Server
Versions	Default: unaffected affected from 8.3.0 to 8.3.13 (excl.) affected from 8.0 to 8.0.34 (excl.) affected from 7.0 to 7.0.45 (excl.) affected from 9.0 to 9.0.4 (excl.)

References

https://jira.mongodb.org/browse/SERVER-134618

Problem Types

CWE-94: Improper Control of Generation of Code ('Code Injection') CWE