CVE-2026-82058 MongoDB CVE debrief

Who should care

Defenders and administrators of MongoDB deployments, particularly those using versions 7.0.0 to 7.0.41, 8.0.0 to 8.0.30, and 8.3.0 to 8.3.9, should assess exposure and prioritize patching.

Why it matters

CVE-2026-82058 is a high-severity vulnerability in MongoDB's JSON Schema validation error generation code. An authenticated user with readWrite privileges can crash the mongod server by submitting a specially crafted BSON document. Defenders should prioritize verifying and applying patches, monitoring for potentially malicious documents, and restricting user privileges to minimize potential impact. The vulnerability's impact is supported by the CVE record and NVD entry, but specific exploitation and business impact details are limited.

• Potential server crashes due to uncaught exceptions
• Need for verification of affected versions and patch application
• Potential for denial-of-service (DoS) attacks
• Requires monitoring and restriction of potentially malicious BSON documents

Technical summary

The vulnerability exists in MongoDB's JSON Schema validation error generation code. An authenticated user with readWrite privileges can crash the mongod server by submitting a BSON document with a malformed numeric field name in an array, which fails a $jsonSchema items type constraint. This occurs because incoming wire protocol BSON validation does not enforce that array element field names are valid, in-range numeric indices. Defenders should prioritize verifying and applying patches for MongoDB versions 7.0.0 to 7.0.41, 8.0.0 to 8.0.30, and 8.3.0 to 8.3.9.

Defensive priority

Defenders should prioritize verifying and applying patches for MongoDB versions 7.0.0 to 7.0.41, 8.0.0 to 8.0.30, and 8.3.0 to 8.3.9. They should also monitor for and restrict potentially malicious BSON documents.

Recommended defensive actions

• Verify and apply patches for MongoDB versions 7.0.0 to 7.0.41, 8.0.0 to 8.0.30, and 8.3.0 to 8.3.9
• Monitor for and restrict potentially malicious BSON documents
• Restrict user privileges to minimize potential impact
• 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 CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. However, the corpus does not establish versions, exploitation, impact, or remediation beyond vendor advisory.

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.