Medium severity · published Jul 22, 2026
CVE-2026-13055
Server crash via aggregation pipeline expression with compound wildcard index specification
6.5
CVSS
0.4%
EPSS
No
On KEV
Description
The `$_internalIndexKey` aggregation expression can be used by any authenticated user to crash a MongoDB server (mongod). The expression fails to handle compound wildcard index specifications, triggering an internal consistency check that aborts the server process. The user must be able to run an aggregation pipeline.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 34% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
MongoDB · MongoDB
7.0 before 7.0.39; 8.0 before 8.0.28; 8.2.0 before 8.2.12; 8.3.0 before 8.3.7 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-13055
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-13055
Vendor Advisory
https://jira.mongodb.org/browse/SERVER-123081
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