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TI-2026-58393 Aliases CVE-2026-84970GHSA-j94p-2ppx-483m

Heap over-read or silent misparse via 32-bit truncation of JSON length in BSON JSON parser

Priority LOW 25CWE-681Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
Low · Low · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

A numeric truncation weakness exists in the JSON parsing component of the MongoDB C++ Driver's BSON library. An actor who controls the text that an embedding application hands to the library's public JSON parsing interface, when that text is very large, can cause the library to read memory beyond the supplied buffer and return it to the caller, to silently accept only part of the input as a complete document, or to terminate the process. No MongoDB server, credentials, or non-default configuration is required; the effect is confined to the process that uses the library.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00124 2nd percentileScored 2026-11-07
Fix Fixed C++ Driver (MongoDB): 4.5.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MongoDBC++ Driver3.2.0 to before 4.5.24.5.2Patch availableCNA
  • C++ Driver VendorMongoDB Affected 3.2.0 to before 4.5.2 Fixed in 4.5.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mongodb:c\+\+_driver:*:*:*:*:*:mongodb:*:*3.2.0 to before 4.5.2VulnerableMongoDB
  • cpe:2.3:a:mongodb:c\+\+_driver:*:*:*:*:*:mongodb:*:* Versions 3.2.0 to before 4.5.2 Vulnerable ·MongoDB

Remediation

  • Fix · CNA C++ Driver (MongoDB) Fixed in 4.5.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    MongoDB C++ Driver 4.5.2

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-58389 BSON element injection via NUL-embedded document keys in builder appendPriority LOW 25
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-84970
  2. 2026-10-03 Alias added: GHSA-j94p-2ppx-483m

References

Advisory 1

  • TI-2026-56243 Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C++ Driver CVSS 4.0HIGH 8.6
  • TI-2026-60059 GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoDB C++ Driver CVSS 4.0MEDIUM 6.1
  • TI-2026-58389 BSON element injection via NUL-embedded document keys in builder append CVSS 4.0MEDIUM 5.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences