Medium
mongo-c-driver — security advisory
An incorrect numeric conversion in the JSON parsing component of the MongoDB C Driver's BSON library may cause an unusually large text value to be silently shortened, or the corresponding field to be omitted, while the parsing operation still reports success and returns no error. An unauthenticated party who can supply the input processed by an application that uses this component may cause that application to hold data that does not match what was submitted, which may result in unintended alteration of data.
- Products
- mongo-c-driver
- Affected versions
- 1.15.0-1, 1.15.1-1, 1.15.2-1, 1.16.0-1, 1.16.1-1, 1.16.1-1build1, 1.16.1-1build2, 1.16.1-1ubuntu0.1~esm1, 1.18.0-1, 1.19.1-1, 1.19.2-1, 1.20.0-1, 1.20.0-1build1, 1.20.1-1, 1.21.0-1, 1.21.0-1build1, 1.21.0-1ubuntu0.1~esm1, 1.24.3-1, 1.24.4-1, 1.25.1-1, 1.25.2-1, 1.25.4-1, 1.26.0-1, 1.26.0-1.1ubuntu1, 1.26.0-1.1ubuntu2, 1.26.0-1.1ubuntu2+esm1, 1.30.4-1ubuntu1, 2.2.0-1, 2.2.1-1, 2.2.2-1, 2.3.1-1, 2.3.2-1, 2.3.3-1build1, 2.5.0-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-84963
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:23 UTC · Revision 1
Source evidence
An incorrect numeric conversion in the JSON parsing component of the MongoDB C Driver's BSON library may cause an unusually large text value to be silently shortened, or the corresponding field to be omitted, while the parsing operation still reports success and returns no error. An unauthenticated party who can supply the input processed by an application that uses this component may cause that application to hold data that does not match what was submitted, which may result in unintended alteration of data.
osv:UBUNTU-CVE-2026-84963
mongo-c-driver
Fixed versions: Not specified
mongo-c-driver
Fixed versions: Not specified
mongo-c-driver
Fixed versions: Not specified
mongo-c-driver
Fixed versions: Not specified
mongo-c-driver
Fixed versions: Not specified
Complete source record
{
"id": "37a08989399e5acc6702d4455c14a5377f184480626a9e5a1caa14768f79d4b2",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-84963",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-84963",
"summary": "An incorrect numeric conversion in the JSON parsing component of the MongoDB C Driver's BSON library may cause an unusually large text value to be silently shortened, or the corresponding field to be omitted, while the parsing operation still reports success and returns no error. An unauthenticated party who can supply the input processed by an application that uses this component may cause that application to hold data that does not match what was submitted, which may result in unintended alteration of data.",
"evidence": "osv:UBUNTU-CVE-2026-84963",
"products": [
{
"name": {
"value": "mongo-c-driver",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.15.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.15.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.15.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.16.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.16.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.16.1-1build1",
"evidence": "/affected/0/versions"
},
{
"value": "1.16.1-1build2",
"evidence": "/affected/0/versions"
},
{
"value": "1.16.1-1ubuntu0.1~esm1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "mongo-c-driver",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.18.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.19.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.19.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.20.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.20.0-1build1",
"evidence": "/affected/1/versions"
},
{
"value": "1.20.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.21.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.21.0-1build1",
"evidence": "/affected/1/versions"
},
{
"value": "1.21.0-1ubuntu0.1~esm1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "mongo-c-driver",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.24.3-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.24.4-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.25.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.25.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.25.4-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.26.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.26.0-1.1ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1.26.0-1.1ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "1.26.0-1.1ubuntu2+esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "mongo-c-driver",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.2.2-1",
"evidence": "/affected/3/versions"
},
{
"value": "2.3.1-1",
"evidence": "/affected/3/versions"
},
{
"value": "2.3.2-1",
"evidence": "/affected/3/versions"
},
{
"value": "2.3.3-1build1",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.0-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "mongo-c-driver",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.30.4-1ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "2.2.0-1",
"evidence": "/affected/4/versions"
},
{
"value": "2.2.1-1",
"evidence": "/affected/4/versions"
},
{
"value": "2.2.2-1",
"evidence": "/affected/4/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-84963",
"aliases": [
"UBUNTU-CVE-2026-84963"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mongo-c-driver",
"purl": "pkg:deb/ubuntu/mongo-c-driver?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"1.15.0-1",
"1.15.1-1",
"1.15.2-1",
"1.16.0-1",
"1.16.1-1",
"1.16.1-1build1",
"1.16.1-1build2",
"1.16.1-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84963.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbson-1.0-0",
"binary_version": "1.16.1-1ubuntu0.1~esm1"
},
{
"binary_name": "libmongoc-1.0-0",
"binary_version": "1.16.1-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mongo-c-driver",
"purl": "pkg:deb/ubuntu/mongo-c-driver?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
"1.18.0-1",
"1.19.1-1",
"1.19.2-1",
"1.20.0-1",
"1.20.0-1build1",
"1.20.1-1",
"1.21.0-1",
"1.21.0-1build1",
"1.21.0-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84963.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbson-1.0-0",
"binary_version": "1.21.0-1ubuntu0.1~esm1"
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{
"binary_name": "libmongoc-1.0-0",
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}
]
}
},
{
"ranges": [
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],
"package": {
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"purl": "pkg:deb/ubuntu/mongo-c-driver?arch=source&distro=esm-apps%2Fnoble",
"ecosystem": "Ubuntu:Pro:24.04:LTS"
},
"versions": [
"1.24.3-1",
"1.24.4-1",
"1.25.1-1",
"1.25.2-1",
"1.25.4-1",
"1.26.0-1",
"1.26.0-1.1ubuntu1",
"1.26.0-1.1ubuntu2",
"1.26.0-1.1ubuntu2+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84963.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbson-1.0-0t64",
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},
{
"binary_name": "libmongoc-1.0-0t64",
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}
]
}
},
{
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],
"package": {
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"purl": "pkg:deb/ubuntu/mongo-c-driver?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
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"2.3.1-1",
"2.3.2-1",
"2.3.3-1build1",
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},
"ecosystem_specific": {
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},
{
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}
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}
},
{
"ranges": [
{
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],
"package": {
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"purl": "pkg:deb/ubuntu/mongo-c-driver?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1.30.4-1ubuntu1",
"2.2.0-1",
"2.2.1-1",
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],
"database_specific": {
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},
"ecosystem_specific": {
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{
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},
{
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}
]
}
}
],
"modified": "2026-10-17T13:01:12.858175187Z",
"provider": "osv",
"upstream": [
"CVE-2026-84963"
],
"references": [
"https://ubuntu.com/security/CVE-2026-84963",
"https://www.cve.org/CVERecord?id=CVE-2026-84963",
"https://jira.mongodb.org/browse/CDRIVER-6407"
]
},
"related_cves": [
{
"value": "CVE-2026-84963",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 361260,
"published_at": "2026-09-03T16:18:00+00:00"
}