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CVE PROGRAM SOURCE RECORD6.5 Medium

CVE-2021-32040

Large aggregation pipelines with a specific stage can crash mongod under default configuration

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Status
Published
Published
Updated
Assigning organization
mongodb

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

MongoDB Inc. MongoDB Server

Default version status: unaffected

  • 5.0 to < 5.0.4affected
  • 4.4 to ≤ 4.4.28affected
  • 4.2 to < 4.2.16affected

References