CVE-2026-9749

No fix known EPSS <1%CVSS 6.5

This issue can occur when running an aggregation pipeline that uses the internal $exchange stage configured with key-range partitioning and order-preserving delivery. If a single key range produces enough documents to fill its exchange buffer (that is, many results are routed to the same consumer), the server reaches the code path where a full per-consumer buffer is detected but the internal "high watermark" for that key range is not updated as intended.

Published 2026-06-09 · CVE record · OSV

Products: mongodb_server

Distro releases