CVE-2026-4148

ExpressionContext use-after-free in classic engine $lookup and $graphLookup aggregation operators

State: Published
Severity: 8.7 High
Published: Mar 17, 2026
Updated: Mar 18, 2026
Reserved: Mar 13, 2026

Description

A use-after-free vulnerability can be triggered in sharded clusters by an authenticated user with the read role who issues a specially crafted $lookup or $graphLookup aggregation pipeline.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	mongodb
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	mongodb

Weaknesses

CWE-416 Use after free

Affected Products

Product	Versions
MongoDB ServerMongoDB Inc	8.2 to before 8.2.6Affected 8.0 to before 8.0.20Affected 7.0 to before 7.0.31Affected

References

https://jira.mongodb.org/browse/SERVER-119319

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