CVE-2026-9749
Medium · 6.5CVSS
6.5
EPSS
0.5%
Published
Jun 9, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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