Description

An issue in MongoDB Server's geospatial validation could allow an authenticated user with write privileges to cause an internal reference to be used after the underlying memory has been freed, through concurrent operations against a collection using a certain type of validator. This could result in a server crash, leading to a denial of service.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-08-11T19:17:24.417Z",
  "pubdate": "2026-08-11T19:17:24.417Z",
  "executiveSummary": "An internal vulnerability exists within MongoDB Server's geospatial validation subsystem, specifically involving a use-after-free condition.\nThe vulnerability allows an authenticated user with write privileges to trigger a memory corruption event, resulting in a server crash and subsequent denial of service.\nThe affected product is MongoDB Server, impacting instances that process concurrent operations against collections utilizing specific validator configurations.\nThe risk implication is service disruption through unexpected daemon termination, impacting database availability.\nAttacker capabilities require authenticated access with write permissions to the targeted collection.\nExploitation requirements include the execution of concurrent operations designed to target the geospatial validation mechanism and induce the race condition leading to the use-after-free state.",
  "technicalDetails": "The vulnerability resides in the MongoDB Server codebase within the geospatial validation component.\nThe root cause is a use-after-free memory management defect where an internal reference is accessed after the underlying memory region has been deallocated.\nThis memory safety violation is triggered during concurrent operations performed against a collection configured with a specific type of validator.\nThe attack flow requires an authenticated actor possessing write privileges within the database environment.\nThe attacker initiates concurrent database operations designed to interact with the vulnerable geospatial validation logic.\nDue to improper synchronization or reference tracking during these concurrent executions, the validation routine interacts with a dangling pointer referencing freed memory.\nThis invalid memory access violates process memory boundaries and triggers an unhandled exception or assertion failure within the storage or query engine.\nConsequently, the mongod process encounters a fatal error and terminates abruptly, causing a denial of service for all connected clients.\nThe post-exploitation impact is limited to availability disruption through process termination; remote code execution or data exfiltration is not described by the vulnerability mechanism."
}