medium6.5
CVE-2026-9749
This issue can occur when running an aggregation pipeline that uses the internal $exchange stage configured with key-range partitioning and order-preserving de…
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mongodb | Mongodb | from 7.0.0 before 7.0.35 from 8.0.0 before 8.0.24 from 8.2.0 before 8.2.10 from 8.3.0 before 8.3.3 |