High severity · published Jun 9, 2026
CVE-2026-9753
Server crash via malformed binary diff passed to $_internalApplyOplogUpdate.
8.1
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
MongoDB · MongoDB
8.3.0 before 8.3.3; 8.2.0 before 8.2.10; 8.0.0 before 8.0.24; 7.0.0 before 7.0.35 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9753
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-9753
Patch
https://jira.mongodb.org/browse/SERVER-124959
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