Medium
mongo-c-driver — security advisory
An integer wraparound in an allocation size calculation in the BSON library's JSON parsing code can cause a buffer to be released while a following copy operation still writes through the stale pointer. On builds where sizes are 32 bits, an unauthenticated party able to supply a sufficiently large JSON input to an application that links the library may cause that application to terminate unexpectedly, resulting in denial of service.
- 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-2026-84965
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:23 UTC · Revision 1
Source evidence
An integer wraparound in an allocation size calculation in the BSON library's JSON parsing code can cause a buffer to be released while a following copy operation still writes through the stale pointer. On builds where sizes are 32 bits, an unauthenticated party able to supply a sufficiently large JSON input to an application that links the library may cause that application to terminate unexpectedly, resulting in denial of service.
osv:UBUNTU-CVE-2026-84965
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": "b6adf13ebe9ae008681f0a629a7b7761caf7736a665e6e63d789f29ee2fe2514",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-84965",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-84965",
"summary": "An integer wraparound in an allocation size calculation in the BSON library's JSON parsing code can cause a buffer to be released while a following copy operation still writes through the stale pointer. On builds where sizes are 32 bits, an unauthenticated party able to supply a sufficiently large JSON input to an application that links the library may cause that application to terminate unexpectedly, resulting in denial of service.",
"evidence": "osv:UBUNTU-CVE-2026-84965",
"products": [
{
"name": {
"value": "mongo-c-driver",
"evidence": "/affected/0/package/name"
},
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"affected_versions": [
{
"value": "1.15.0-1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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{
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"evidence": "/affected/0/versions"
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{
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{
"name": {
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"evidence": "/affected/1/versions"
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{
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{
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{
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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{
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},
{
"name": {
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"evidence": "/affected/2/package/name"
},
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"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"
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{
"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"
},
{
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"evidence": "/affected/2/versions"
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},
{
"name": {
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"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"
},
{
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"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
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{
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]
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],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-84965",
"aliases": [
"UBUNTU-CVE-2026-84965"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/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-2026-84965.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbson-1.0-0",
"binary_version": "1.16.1-1ubuntu0.1~esm1"
},
{
"binary_name": "libmongoc-1.0-0",
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}
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},
{
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"package": {
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"purl": "pkg:deb/ubuntu/mongo-c-driver?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
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"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"
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},
"versions": [
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"1.24.4-1",
"1.25.1-1",
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},
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{
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],
"modified": "2026-10-17T13:01:12.922804471Z",
"provider": "osv",
"upstream": [
"CVE-2026-84965"
],
"references": [
"https://ubuntu.com/security/CVE-2026-84965",
"https://www.cve.org/CVERecord?id=CVE-2026-84965",
"https://jira.mongodb.org/browse/CDRIVER-6405"
]
},
"related_cves": [
{
"value": "CVE-2026-84965",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/2/score"
},
"source_id": "core-osv",
"document_id": 361266,
"published_at": "2026-09-03T16:18:00+00:00"
}