CVE-2026-89099 MongoDB CVE debrief

Who should care

Defenders responsible for MongoDB Server deployments, especially those with user-influenced content, should assess potential exposure and impact on confidentiality, integrity, and availability.

Why it matters

CVE-2026-89099 is a high-severity vulnerability in MongoDB Server's document value layer, allowing an authenticated user to trigger a race condition leading to memory corruption and potential server termination. Defenders should prioritize verifying exposure and assessing potential impact on MongoDB Server deployments.

• Potential server termination and memory corruption
• Impact on confidentiality, integrity, and availability of affected server process
• Need for verification of exposure and assessment of potential impact
• Priority for compensating controls and monitoring

Technical summary

A race condition in the document value layer of MongoDB Server can allow concurrent server threads to operate on the same internal memory without synchronization, leading to memory corruption. An authenticated user holding ordinary read-write privileges on a database may be able to trigger this condition over the normal client protocol, resulting in server termination and potential corruption of process memory with user-influenced content.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact on MongoDB Server deployments, especially those with user-influenced content.

Recommended defensive actions

• Verify MongoDB Server deployments for potential exposure
• Assess impact on confidentiality, integrity, and availability
• Monitor for user-influenced content
• Consider compensating controls for read-write privileges
• Review vendor guidance for patching and mitigation
• Conduct asset inventory to identify potentially affected systems
• Track changes and updates to MongoDB Server deployments

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. Additional information on affected versions and exploitation is limited. Defenders should verify exposure and assess potential impact on MongoDB Server deployments, especially those with user-influenced content. Limited source detail suggests focusing on CVE and NVD for now, with extra verification needed due to potential memory corruption and server termination risks.

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.