CVE-2021-32040

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.

• CWE-121
• CWE-787

• 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

Published

Apr 12, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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