CVE-2026-13055: CWE-617: Reachable Assertion in MongoDB MongoDB Server
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.
AI Analysis
Technical Summary
The vulnerability identified as CVE-2026-13055 in MongoDB Server involves the $_internalIndexKey aggregation expression. When used by an authenticated user, this expression fails to correctly process compound wildcard index specifications, causing an internal consistency check to fail and the server process to abort. This results in a denial-of-service condition by crashing the mongod process. The vulnerability is classified under CWE-617 (Reachable Assertion).
Potential Impact
An authenticated user with permission to run aggregation pipelines can cause the MongoDB server process to crash, resulting in denial of service. There is no indication of privilege escalation, data corruption, or data disclosure from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, restrict aggregation pipeline execution privileges to trusted users only to reduce risk.
CVE-2026-13055: CWE-617: Reachable Assertion in MongoDB MongoDB Server
Description
The `$_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 v4.0
Score 7.1high
Affected software
pkg:github/mongodb/mongoRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-13055 in MongoDB Server involves the $_internalIndexKey aggregation expression. When used by an authenticated user, this expression fails to correctly process compound wildcard index specifications, causing an internal consistency check to fail and the server process to abort. This results in a denial-of-service condition by crashing the mongod process. The vulnerability is classified under CWE-617 (Reachable Assertion).
Potential Impact
An authenticated user with permission to run aggregation pipelines can cause the MongoDB server process to crash, resulting in denial of service. There is no indication of privilege escalation, data corruption, or data disclosure from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, restrict aggregation pipeline execution privileges to trusted users only to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-06-23T17:59:56.769Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a61231e9c2644c7f89b2c79
Added to database: 07/22/2026, 20:07:58 UTC
Last enriched: 07/22/2026, 20:37:11 UTC
Last updated: 07/22/2026, 23:34:44 UTC
Views: 12
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