PT-2026-48295 · Mongodb · Mongodb Server

Published 2026-06-09 · Updated 2026-06-09 · CVE-2026-9749

Mitre

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

Fix

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

CVE-2026-9749

Affected Products

Mongodb Server

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-9749 · Security Note
• https://jira.mongodb.org/browse/SERVER-124031 · Note