CVE-2021-32040

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

It may be possible to have an extremely long aggregation pipeline in conjunction with a specific stage/operator and cause a stack overflow due to the size of the stack frames used by that stage. If an attacker could cause such an aggregation to occur, they could maliciously crash MongoDB in a DoS attack. This vulnerability affects MongoDB Server v4.4 versions prior to and including 4.4.28, MongoDB Server v5.0 versions prior to 5.0.4 and MongoDB Server v4.2 versions prior to 4.2.16.

Workaround: >= v4.2.16 users and all v4.4 users can add the --setParameter internalPipelineLengthLimit=50 instead of the default 1000 to mongod at startup to prevent a crash.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-121 CWE-787

Affected software

Vendor	Product	Versions
MongoDB Inc.	MongoDB Server	>= 5.0, < 5.0.4; >= 4.4, <= 4.4.28; >= 4.2, < 4.2.16
mongodb	mongodb	>= 5.0, < 5.0.4; >= 4.4, <= 4.4.28; >= 4.2, < 4.2.16

References

https://jira.mongodb.org/browse/SERVER-58203Issue Tracking, Patch, Vendor Advisory
https://jira.mongodb.org/browse/SERVER-59299Issue Tracking, Patch, Vendor Advisory
https://jira.mongodb.org/browse/SERVER-60218Issue Tracking, Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20220609-0005/Third Party Advisory
https://jira.mongodb.org/browse/SERVER-58203Issue Tracking, Patch, Vendor Advisory
https://jira.mongodb.org/browse/SERVER-59299Issue Tracking, Patch, Vendor Advisory
https://jira.mongodb.org/browse/SERVER-60218Issue Tracking, Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20220609-0005/Third Party Advisory

Timeline

Published: Apr 12, 2022
Last modified: Jun 17, 2026
NVD status: Modified

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