CVE-2026-106435
Application denial of service via out-of-bounds read in BSON Regex decoding in MongoDB Python Driver
CVSS Score
5.1
EPSS Score
0.0%
EPSS Percentile
0th
The MongoDB Python Driver's binary accelerator can read outside a buffer when an application decodes malformed BSON containing a truncated regular-expression element without a trailing NUL byte. An actor who can supply BSON to the documented decode or decode_all API can cause the application process to terminate when the C extension is loaded. The driver's normal database wire-protocol path does not reach this code.
| CWE | CWE-125 |
| Vendor | mongodb |
| Product | python driver |
| Ecosystems | |
| Industries | Technology |
| Published | Oct 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
MongoDB / Python Driver
0.10.3 ≤ 4.18.2