{"id":"BIT-mongodb-2021-32040","summary":"Large aggregation pipelines with a specific stage can crash mongod under default configuration","details":"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.\n\nWorkaround: \u003e= 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.","aliases":["CVE-2021-32040"],"modified":"2026-09-08T08:48:13.870609800Z","published":"2024-03-06T10:57:09.971Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"https://jira.mongodb.org/browse/SERVER-58203"},{"type":"ADVISORY","url":"https://jira.mongodb.org/browse/SERVER-59299"},{"type":"ADVISORY","url":"https://jira.mongodb.org/browse/SERVER-60218"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20220609-0005/"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-32040"}],"affected":[{"package":{"name":"mongodb","ecosystem":"Bitnami","purl":"pkg:bitnami/mongodb"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.2.0"},{"fixed":"4.2.16"},{"introduced":"4.4.0"},{"fixed":"4.4.11"},{"introduced":"5.0.0"},{"fixed":"5.0.4"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/mongodb/BIT-mongodb-2021-32040.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}],"schema_version":"1.9.0"}