CVE-2026-4358

Memory safety issues in slot-based execution hash table spill

State: Published
Severity: 6.1 Medium
Published: Mar 17, 2026
Updated: Mar 17, 2026
Reserved: Mar 17, 2026

Description

A specially crafted aggregation query with $lookup by an authenticated user with write privileges can cause a double-free or use-after-free memory issue in the slot-based execution (SBE) engine when an in-memory hash table is spilled to disk.

Scores

CVSS	Score	Vector	Source
4.0	6.1 Medium	CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N	mongodb
3.1	6.4 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H	mongodb

Weaknesses

CWE-415 Double 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-118849

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