What’s Vulnerable › Vulnerabilities
CVE-2026-9748: $_internalConvertBucketIndexStats may crash the mongod server when working on no timeseries input
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-09 · updated 2026-07-23
- Weakness: CWE-617
Description
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.
Affected products
- MongoDB: from 7.0.0 before 7.0.35; from 8.0.0 before 8.0.10; from 8.2.0 before 8.2.10; from 8.3.0 before 8.3.3 — fixed in 7.0.35, 8.0.10, 8.2.10, 8.3.3
How to fix
Upgrade to a fixed version: MongoDB 7.0.35, 8.0.10, 8.2.10, 8.3.3. Check the vendor advisory for mitigations.
References
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