CVE-2026-9753

Server crash via malformed binary diff passed to $_internalApplyOplogUpdate.

CVE-2026-9753 is fixed in MongoDB on 1 platform by MongoDB 8.3.3 (version 8.3.3), released May 28, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.2

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0030

22nd percentile

The $_internalApplyOplogUpdate aggregation pipeline stage can be used to execute a document diff containing a malformed binary diff to return memory out-of-bounds or crash the server. $_internalApplyOplogUpdate can be executed by any authenticated user with access to the aggregate command.

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
MongoDB	8.3.3	MongoDB 8.3.3	May 28, 2026

Details

Published
June 9, 2026
Weakness
CWE-1287: Improper validation of specified type of input
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-9753

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