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TI-2026-58392 Aliases CVE-2026-84969GHSA-9xr7-hhfx-wh4c

Heap overflow via truncated base64 encoding of binary fields in length-limited JSON output

Priority LOW 28CWE-787Published · Updated

Key facts

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

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

Summary

A memory-handling error in the BSON-to-JSON conversion helpers of the MongoDB C Driver can write a small number of bytes past the end of a heap buffer when a binary field is encoded and the output is cut short at a caller-configured length limit. A party who supplies the document content, with no privileges on the application that links the driver, may cause a small amount of data outside the intended buffer to be altered.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00271 19th percentileScored 2026-11-07
Fix Fixed C Driver (MongoDB): 1.30.9, 2.5.2

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 Driver1.30.0 to before 1.30.9; 2.0.0 to before 2.5.21.30.9, 2.5.2Patch availableCNA
  • C Driver VendorMongoDB Affected 1.30.0 to before 1.30.9; 2.0.0 to before 2.5.2 Fixed in 1.30.9, 2.5.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:*1.30.0 to before 1.30.9; 2.0.0 to before 2.5.2VulnerableMongoDB
  • cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:* Versions 1.30.0 to before 1.30.9; 2.0.0 to before 2.5.2 Vulnerable ·MongoDB

Remediation

  • Fix · CNA C Driver (MongoDB) Fixed in 1.30.9, 2.5.2

Fixed in the same release

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

  • Release ·

    MongoDB C Driver 1.30.9, 2.5.2

    4 records Highest priority Priority LOW 4 LOW

    Other records, highest priority first

    • TI-2026-58387 Heap corruption via OCSP request double free from crafted multi-URL certificate in TLS clientPriority LOW 35
    • TI-2026-58386 Silent field truncation via unchecked int cast of huge JSON string values in JSON-to-BSON parserPriority LOW 34
    • TI-2026-58388 Heap write primitive via size round-up wrap during JSON parsing on 32-bit buildsPriority LOW 25
    Show all 4 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-84969
  2. 2026-10-03 Alias added: GHSA-9xr7-hhfx-wh4c

References

Advisory 1

  • TI-2026-62966 Heap overflow via oversized decrypted TLS record sequence in Windows Secure Channel stream CVSS 4.0CRITICAL 9.2
  • TI-2026-05870 MongoDB C Driver Cyrus SASL Canonicalization Buffer Overflow CVSS 4.0HIGH 8.6
  • TI-2026-62968 Integer Underflow → Heap Out-of-Bounds Read in `bson_new_from_buffer() CVSS 4.0MEDIUM 6.9
  • TI-2024-07001 Accessing Untrusted Directory May Allow Local Privilege Escalation CVSS 3.1HIGH 7.8
  • TI-2026-58387 Heap corruption via OCSP request double free from crafted multi-URL certificate in TLS client CVSS 4.0HIGH 8.2
  • TI-2023-00414 MongoDB client C Driver may infinitely loop when validating certain BSON input data CVSS 3.1HIGH 7.5
See all 20 →

Sources

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