CVE-2026-9748

The $_internalConvertBucketIndexStats stage used PauseExecution as a way to signal "skip this document" when an index stats conversion failed. But PauseExecution is not a general purpose skip mechanism, but rather a TeeBuffer-internal signal used solely by $facet to coordinate its sub-pipelines. When this stage is placed before $facet in a pipeline, TeeBuffer receives the unexpected PauseExecution from upstream and hits a hard invariant assertion, crashing mongod.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://jira.mongodb.org/browse/SERVER-123951	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mongodb:mongodb::::::::
	cpe:2.3:a:mongodb:mongodb::::::::
	cpe:2.3:a:mongodb:mongodb::::::::
	cpe:2.3:a:mongodb:mongodb::::::::

History

No history.

Information

Published : 2026-06-09 23:17

Updated : 2026-07-23 09:10

NVD link : CVE-2026-9748

Mitre link : CVE-2026-9748

CVE.ORG link : CVE-2026-9748

JSON object : View

Products Affected

mongodb

mongodb

CWE

CWE-617

Reachable Assertion

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But PauseExecution is not a general purpose skip mechanism, but rather a TeeBuffer-internal signal used solely by $facet to coordinate its sub-pipelines. When this stage is placed before $facet in a pipeline, TeeBuffer receives the unexpected PauseExecution from upstream and hits a hard invariant assertion, crashing mongod."}, {"lang": "es", "value": "La etapa $_internalConvertBucketIndexStats us\u00f3 PauseExecution como una forma de se\u00f1alar 'saltar este documento' cuando fallaba una conversi\u00f3n de estad\u00edsticas de \u00edndice. Pero PauseExecution no es un mecanismo de salto de prop\u00f3sito general, sino m\u00e1s bien una se\u00f1al interna de TeeBuffer utilizada \u00fanicamente por $facet para coordinar sus sub-tuber\u00edas. Cuando esta etapa se coloca antes de $facet en una tuber\u00eda, TeeBuffer recibe el PauseExecution inesperado de upstream y alcanza una aserci\u00f3n invariante dura, colapsando mongod."}], "lastModified": "2026-07-23T09:10:00.113", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4A597EDD-7227-4462-9742-EC211F3D3043", "versionEndExcluding": "7.0.35", "versionStartIncluding": "7.0.0"}, {"criteria": "cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CB0E4B87-D42B-446A-A8C3-51258076AFF2", "versionEndExcluding": "8.0.10", "versionStartIncluding": "8.0.0"}, {"criteria": "cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F3BDF7B8-82C8-4F03-9614-6FD73582D174", "versionEndExcluding": "8.2.10", "versionStartIncluding": "8.2.0"}, {"criteria": "cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "565AB85D-0F4A-4ED3-B951-7949D7AB85A6", "versionEndExcluding": "8.3.3", "versionStartIncluding": "8.3.0"}], "operator": "OR"}]}], "sourceIdentifier": "cna@mongodb.com"}