CVE-2026-96749 MongoDB Python Driver - Integer Overflow

MongoDB Python Driver contains an integer overflow caused by improper size arithmetic in BSON document encoding, letting attackers with no privileges cause out-of-bounds write, exploit requires attacker to supply very large data.

CVSS base score 8.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.13% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Integer Overflow
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
24 September 2026
Updated
15 October 2026
Weakness
CWE-190

Vendor fix

Update to the latest version of MongoDB Python Driver.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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