{"id":"CVE-2026-96749","title":"An integer overflow in the BSON document encoding component of the MongoDB Python Driver's bundled native extension may occur when a single document is built from an unusually large amount of caller-supplied data","summary":"An integer overflow in the BSON document encoding component of the MongoDB Python Driver's bundled native extension may occur when a single document is built from an unusually large amount of caller-supplied data. Size arithmetic is perf…","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-190","CWE-787"],"vendor":"MongoDB","product":"Python Driver","affected":["python_driver >= 1.9.0 < 4.18.2"],"published":"2026-09-24","updated":"2026-09-26","sourceUpdated":"2026-09-26T04:17:52.260","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-96749","references":[{"url":"https://github.com/mongodb/mongo-python-driver/blob/4.18.2/doc/changelog.rst","label":"cna@mongodb.com"},{"url":"https://github.com/mongodb/mongo-python-driver/releases/tag/4.18.2","label":"cna@mongodb.com"},{"url":"https://github.com/mongodb/mongo-python-driver/security/advisories/GHSA-v4x9-3549-crwv","label":"cna@mongodb.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-96749.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-96749"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2540688"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-96749"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96749"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-25T00:00:00+00:00"},"epss":0.00132,"epssPercentile":0.02283,"ingestedAt":"2026-09-24T18:49:36.719Z","slug":"CVE-2026-96749","body":"## Overview\n\nAn integer overflow in the BSON document encoding component of the MongoDB Python Driver's bundled native extension may occur when a single document is built from an unusually large amount of caller-supplied data. Size arithmetic is performed in a signed 32-bit type, and the guard meant to catch the overflow is written in a form whose behavior is not defined by the C language standard. A party with no privileges who can place a very large value into data that an application encodes may, depending on how the native extension was built, cause a write outside the bounds of an allocated buffer inside the application's own process.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat OpenShift AI (RHOAI), Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1 · no fix planned: Red Hat OpenShift AI (RHOAI), Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1 · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-96749.json)","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}