Vulnerability details
CVE-2026-93393
MongoDB C Driver
Heap overflow via oversized decrypted TLS record sequence in Windows Secure Channel stream
CVSS 4.0
9.2Critical
Official description
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.2Critical | 4.0 | CVEProject cvelistV5 (CNA) (mongodb) | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| 8.1High | 3.1 | CVEProject cvelistV5 (CNA) (mongodb) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| MongoDB, Inc. | C Driver | 2.4.0 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | C Driver | 1.24.0 ≤ v ≤ 1.24.4 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | C Driver | 1.25.0 ≤ v ≤ 1.25.4 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | C Driver | 1.26.0 ≤ v ≤ 1.26.2 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | C Driver | 1.27.0 ≤ v ≤ 1.27.6 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | C Driver | 1.28.0 ≤ v ≤ 1.28.1 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | C Driver | 1.29.0 ≤ v ≤ 1.29.2 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | C Driver | 1.30.0 ≤ v ≤ 1.30.8 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | C Driver | 2.0.0 ≤ v ≤ 2.0.2 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | C Driver | 2.1.0 ≤ v ≤ 2.1.2 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | C Driver | 2.2.0 ≤ v ≤ 2.2.4 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | C Driver | 2.3.0 ≤ v ≤ 2.3.3 | CVEProject cvelistV5 (CNA) |
References and advisories
1
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Details
- Published
- 2026-09-17
- Last updated
- 2026-09-18
- State
- Published
- Assigner (CNA)
- mongodb
Exploit prediction (EPSS)
0.46%
Probability of exploitation in 30 days
40.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-787Out-of-bounds Write