High
pymongo — security advisory
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 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.
- Products
- pymongo
- Affected versions
- 2.6-1, 2.6.2-1, 2.6.3-1, 2.6.3-1build1, 3.0.3-1, 3.10.1-0ubuntu2, 3.10.1-0ubuntu2.1, 3.11.0-1build2, 3.11.0-1build3, 3.11.0-1build4, 3.11.0-1build6, 3.11.0-1build7, 3.11.0-1build8, 3.11.0-1ubuntu0.22.04.1, 3.11.0-1ubuntu0.24.04.1, 3.2-1, 3.2-1build1, 3.2-1ubuntu0.1~esm1, 3.4.0-1build2, 3.6.1+dfsg1-1, 3.6.1+dfsg1-1ubuntu0.1~esm1, 3.7.1-1.1, 3.7.1-1.1build1, 4.10.1-6, 4.15.3-1, 4.15.3-2, 4.15.5-1, 4.16.0-1, 4.16.0-1build1, 4.17.0-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-96749
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:35 UTC · Revision 1
Source evidence
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 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.
osv:UBUNTU-CVE-2026-96749
pymongo
Fixed versions: Not specified
pymongo
Fixed versions: Not specified
pymongo
Fixed versions: Not specified
pymongo
Fixed versions: Not specified
pymongo
Fixed versions: Not specified
pymongo
Fixed versions: Not specified
pymongo
Fixed versions: Not specified
pymongo
Fixed versions: Not specified
Complete source record
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"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-96749",
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],
"modified": "2026-10-17T13:01:20.158692880Z",
"provider": "osv",
"upstream": [
"CVE-2026-96749"
],
"references": [
"https://ubuntu.com/security/CVE-2026-96749",
"https://www.cve.org/CVERecord?id=CVE-2026-96749"
]
},
"related_cves": [
{
"value": "CVE-2026-96749",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361744,
"published_at": "2026-09-24T19:17:00+00:00"
}