How severe is CVE-2026-81490?

CVE-2026-81490 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-81490 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-81490?

CVE-2026-81490 affects Mongodb Bi Connector. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-81490?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-81490 published?

CVE-2026-81490 was published on 2026-08-28 and last updated on 2026-09-29.

CVE-2026-81490

CVE-2026-81490 is a high-severity vulnerability in Mongodb Bi Connector with a CVSS 3.x base score of 7.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: High (CVSS 3.x base score 7.7)
CVSS v4: 8.3
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Mongodb Bi Connector
Published: 2026-08-28
Last modified: 2026-09-29

Description

A database user able to create a view in a namespace that MongoDB Connector for BI samples can cause the schema-sampling routine to stop functioning by defining a view whose evaluation reliably fails. The sampling logic classifies the resulting server message as transient and, after the configured retries are exhausted, proceeds without a valid result, ending the schema refresh routine. The mongosqld process continues running without a usable schema, so SQL clients are unable to obtain results until an operator removes the view or excludes its namespace from sampling.

Frequently asked questions

What is CVE-2026-81490?: A database user able to create a view in a namespace that MongoDB Connector for BI samples can cause the schema-sampling routine to stop functioning by defining a view whose evaluation reliably fails. The sampling logic classifies the resulting server message as transient and, after the configured retries are exhausted, proceeds without a valid result, ending the schema refresh routine. The mongosqld process continues running without a usable schema, so SQL clients are unable to obtain results until an operator removes the view or excludes its namespace from sampling.
How severe is CVE-2026-81490?: CVE-2026-81490 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-81490 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-81490?: CVE-2026-81490 affects Mongodb Bi Connector. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-81490?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-81490 published?: CVE-2026-81490 was published on 2026-08-28 and last updated on 2026-09-29.

References

https://www.mongodb.com/docs/bi-connector/current/release-notes/

Affected products (1)

cpe:2.3:a:mongodb:bi_connector:*:*:*:*:*:*:*:*

More vulnerabilities in Mongodb Bi Connector

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CVE-2026-81518 — High (CVSS 7.5): When mongosqld is configured with a client certificate authority file, the listener requests a client certificate…
CVE-2026-81517 — High (CVSS 7.5): An unauthenticated party able to reach the port of a MongoDB Connector for BI (mongosqld) instance may generate enough…
CVE-2026-75159 — Medium (CVSS 5.9): An unauthenticated client that can reach a MongoDB Connector for BI deployment configured with Kerberos authentication…
CVE-2026-77184 — Medium (CVSS 5.2): In MongoDB Connector for BI, the description text of a collection's JSON schema validator is incorporated into the…

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Other CWE-476 (NULL Pointer Dereference) vulnerabilities

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