What is CVE-2026-9749?

CVE-2026-9749 is a medium-severity vulnerability, classified under Reachable Assertion. CVSS score: 6.5/10. Published 2026-06-09.

How severe is CVE-2026-9749?

Medium severity. CVSS v3 base score is 6.5 out of 10.

CVE-2026-9749

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 delivery. If a single key range produces enough documents to fill its exchange buf…

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

cna@mongodb.com

Frequently asked questions

What is CVE-2026-9749?: CVE-2026-9749 is a medium-severity vulnerability, classified under Reachable Assertion. CVSS score: 6.5/10. Published 2026-06-09.
How severe is CVE-2026-9749?: Medium severity. CVSS v3 base score is 6.5 out of 10.