HighFix available
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
- 3.11.0-1, 3.11.0-1+deb12u1, 4.10.1-1, 4.10.1-2, 4.10.1-3, 4.10.1-4, 4.10.1-5, 4.10.1-6, 4.15.3-1, 4.15.3-2, 4.15.4-1, 4.15.4-2, 4.15.5-1, 4.16.0-1, 4.17.0-1, 4.18.1-1, 4.18.2-1, 4.7.3-1, 4.7.3-2
- Fixed versions
- 4.18.2-1
- CVEs
- CVE-2026-96749
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 06:34 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:DEBIAN-CVE-2026-96749
pymongo
Fixed versions: Not specified
pymongo
Fixed versions: Not specified
pymongo
Fixed versions: 4.18.2-1
Complete source record
{
"id": "9b53beae2bc14e5bb1206b77fddd049fe02815697e7f6113123c49c7dfc7f605",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-96749",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-96749",
"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 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.",
"evidence": "osv:DEBIAN-CVE-2026-96749",
"products": [
{
"name": {
"value": "pymongo",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.11.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.11.0-1+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "4.10.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.10.1-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.10.1-3",
"evidence": "/affected/0/versions"
},
{
"value": "4.10.1-4",
"evidence": "/affected/0/versions"
},
{
"value": "4.10.1-5",
"evidence": "/affected/0/versions"
},
{
"value": "4.10.1-6",
"evidence": "/affected/0/versions"
},
{
"value": "4.15.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.15.3-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.15.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.15.4-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.15.5-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.16.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.18.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.18.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.7.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.7.3-2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "pymongo",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.10.1-6",
"evidence": "/affected/1/versions"
},
{
"value": "4.15.3-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.15.3-2",
"evidence": "/affected/1/versions"
},
{
"value": "4.15.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.15.4-2",
"evidence": "/affected/1/versions"
},
{
"value": "4.15.5-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.16.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.17.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.18.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.18.2-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "pymongo",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.18.2-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "4.10.1-6",
"evidence": "/affected/2/versions"
},
{
"value": "4.15.3-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.15.3-2",
"evidence": "/affected/2/versions"
},
{
"value": "4.15.4-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.15.4-2",
"evidence": "/affected/2/versions"
},
{
"value": "4.15.5-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.16.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.17.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.18.1-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-96749",
"aliases": [
"DEBIAN-CVE-2026-96749"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "pymongo",
"purl": "pkg:deb/debian/pymongo?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.11.0-1",
"3.11.0-1+deb12u1",
"4.10.1-1",
"4.10.1-2",
"4.10.1-3",
"4.10.1-4",
"4.10.1-5",
"4.10.1-6",
"4.15.3-1",
"4.15.3-2",
"4.15.4-1",
"4.15.4-2",
"4.15.5-1",
"4.16.0-1",
"4.17.0-1",
"4.18.1-1",
"4.18.2-1",
"4.7.3-1",
"4.7.3-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-96749.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "pymongo",
"purl": "pkg:deb/debian/pymongo?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"4.10.1-6",
"4.15.3-1",
"4.15.3-2",
"4.15.4-1",
"4.15.4-2",
"4.15.5-1",
"4.16.0-1",
"4.17.0-1",
"4.18.1-1",
"4.18.2-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-96749.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.18.2-1"
}
]
}
],
"package": {
"name": "pymongo",
"purl": "pkg:deb/debian/pymongo?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"4.10.1-6",
"4.15.3-1",
"4.15.3-2",
"4.15.4-1",
"4.15.4-2",
"4.15.5-1",
"4.16.0-1",
"4.17.0-1",
"4.18.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-96749.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-12T11:00:46.078538077Z",
"provider": "osv",
"upstream": [
"CVE-2026-96749"
],
"references": [
"https://security-tracker.debian.org/tracker/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": 299784,
"published_at": "2026-09-24T19:17:20.963+00:00"
}