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.
Metrics
Affected Vendors & Products
References
| Link | Providers |
|---|---|
| https://jira.mongodb.org/browse/SERVER-124031 |
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History
Wed, 10 Jun 2026 14:30:00 +0000
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ssvc
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Wed, 10 Jun 2026 00:45:00 +0000
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| First Time appeared |
Mongodb
Mongodb mongodb Server |
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| Vendors & Products |
Mongodb
Mongodb mongodb Server |
Tue, 09 Jun 2026 22:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | Using MaxKey() may crash the server | |
| Weaknesses | CWE-617 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: mongodb
Published: 2026-06-09T22:10:45.815Z
Updated: 2026-06-10T13:32:50.141Z
Reserved: 2026-05-27T17:47:39.152Z
Link: CVE-2026-9749
Updated: 2026-06-10T13:32:45.491Z
Status : Received
Published: 2026-06-09T23:17:04.380
Modified: 2026-06-09T23:17:04.380
Link: CVE-2026-9749
No data.