CVE-2026-81533 MongoDB CVE debrief

Who should care

Defenders responsible for MongoDB BI Connector ODBC Driver configurations and deployments should assess exposure and verify the prefetch setting. This includes operators, platform administrators, vulnerability management teams, and security teams who need to ensure that the driver is updated and configurations are secure.

Why it matters

Defenders should care about CVE-2026-81533 because it affects the MongoDB BI Connector ODBC Driver, potentially leading to application process termination or memory corruption when the prefetch setting is enabled and specific SQL statements are used. Verification of configurations and driver updates are necessary.

• Potential unexpected termination of the hosting application process.
• Possible corruption of adjacent memory in the hosting application process.
• Need for verification of prefetch setting configurations.
• Priority for updating the driver to a version that addresses this issue.

Technical summary

The MongoDB BI Connector ODBC Driver is vulnerable to a memory-safety issue when handling SQL statements with long digit sequences following a LIMIT clause, specifically when the driver's optional prefetch setting is enabled. This could lead to the hosting application process terminating unexpectedly or corrupting adjacent memory. The issue arises from the driver's handling of long digit sequences, which can cause buffer overflow and lead to denial-of-service or potential code execution. The vulnerability is confirmed to occur in the MongoDB BI Connector ODBC Driver when the prefetch setting is enabled and a SQL statement contains an unusually long run of digits following a LIMIT clause.

Defensive priority

Defenders should prioritize verifying the prefetch setting in their MongoDB BI Connector ODBC Driver configurations and ensure that the driver is updated to a version that addresses this issue.

Recommended defensive actions

• Verify the prefetch setting in MongoDB BI Connector ODBC Driver configurations.
• Update the driver to a version that addresses this issue.
• Review and restrict SQL statements to prevent unusually long digit sequences following LIMIT clauses.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The issue is confirmed to occur in the MongoDB BI Connector ODBC Driver when the prefetch setting is enabled and a SQL statement contains an unusually long run of digits following a LIMIT clause. The driver copies the digit sequence into a fixed-size internal buffer without checking its length.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.