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TI-2026-62966 Aliases CVE-2026-93393GHSA-x65h-hw7w-mq6w

Heap overflow via oversized decrypted TLS record sequence in Windows Secure Channel stream

Priority MEDIUM 42CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

A heap-based buffer overflow exists in the TLS transport layer of the MongoDB C Driver when built with the Windows platform TLS backend. A remote endpoint that the client connects to can cause the driver to write uncontrolled data outside the bounds of a heap allocation while processing incoming encrypted traffic after the TLS handshake completes. No authentication or user interaction is required, because the affected processing occurs before any application-level authentication completes. Triggering this issue may lead to memory corruption in the client process, disclosure of adjacent heap memory, or termination of the process.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00468 40th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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 Driver2.4.0; 2.3.0 – 2.3.3; 2.2.0 – 2.2.4; 2.1.0 – 2.1.2; 2.0.0 – 2.0.2; 1.30.0 – 1.30.8; 1.29.0 – 1.29.2; 1.28.0 – 1.28.1; 1.27.0 – 1.27.6; 1.26.0 – 1.26.2; 1.25.0 – 1.25.4; 1.24.0 – 1.24.4—No fix listedCNA
  • C Driver VendorMongoDB Affected 2.4.0; 2.3.0 – 2.3.3; 2.2.0 – 2.2.4; 2.1.0 – 2.1.2; 2.0.0 – 2.0.2; 1.30.0 – 1.30.8; 1.29.0 – 1.29.2; 1.28.0 – 1.28.1; 1.27.0 – 1.27.6; 1.26.0 – 1.26.2; 1.25.0 – 1.25.4; 1.24.0 – 1.24.4 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:*1.10.0 to before 1.30.11; 2.2.0 to before 2.5.4VulnerableMongoDB
  • cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:* Versions 1.10.0 to before 1.30.11; 2.2.0 to before 2.5.4 Vulnerable ·MongoDB

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-93393
  2. 2026-10-03 Alias added: GHSA-x65h-hw7w-mq6w

References

Advisory 1

  • 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
  • TI-2026-58386 Silent field truncation via unchecked int cast of huge JSON string values in JSON-to-BSON parser CVSS 4.0MEDIUM 6.3
See all 20 →

Sources

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