Medium
libmongocrypt — security advisory
A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be accepted without sanitization. The resulting impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application.
- Products
- libmongocrypt
- Affected versions
- 1.13.2-1, 1.17.0-1, 1.19.0-1, 1.19.1-1, 1.2.1-1, 1.2.2-1, 1.20.0-1, 1.20.1-1build1, 1.20.2-1, 1.3.0-1, 1.3.0-1ubuntu1, 1.7.2-1, 1.8.2-1, 1.8.4-1, 1.8.4-1build2, 1.8.4-1build3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-81523
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:20 UTC · Revision 1
Source evidence
A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be accepted without sanitization. The resulting impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application.
osv:UBUNTU-CVE-2026-81523
libmongocrypt
Fixed versions: Not specified
libmongocrypt
Fixed versions: Not specified
libmongocrypt
Fixed versions: Not specified
libmongocrypt
Fixed versions: Not specified
Complete source record
{
"id": "32bae19f5998a68fbd3424ff34ab1dd1caa2ef8fe1297fd275aec72d3a7030c7",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-81523",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-81523",
"summary": "A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be accepted without sanitization. The resulting impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application.",
"evidence": "osv:UBUNTU-CVE-2026-81523",
"products": [
{
"name": {
"value": "libmongocrypt",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.2.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.2.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.0-1ubuntu1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "libmongocrypt",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.7.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.8.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.8.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.8.4-1build2",
"evidence": "/affected/1/versions"
},
{
"value": "1.8.4-1build3",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "libmongocrypt",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.17.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.19.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.19.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.20.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.20.1-1build1",
"evidence": "/affected/2/versions"
},
{
"value": "1.20.2-1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "libmongocrypt",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.13.2-1",
"evidence": "/affected/3/versions"
},
{
"value": "1.17.0-1",
"evidence": "/affected/3/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-81523",
"aliases": [
"UBUNTU-CVE-2026-81523"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libmongocrypt",
"purl": "pkg:deb/ubuntu/libmongocrypt?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1.2.1-1",
"1.2.2-1",
"1.3.0-1",
"1.3.0-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81523.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmongocrypt0",
"binary_version": "1.3.0-1ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libmongocrypt",
"purl": "pkg:deb/ubuntu/libmongocrypt?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"1.7.2-1",
"1.8.2-1",
"1.8.4-1",
"1.8.4-1build2",
"1.8.4-1build3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81523.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmongocrypt0",
"binary_version": "1.8.4-1build3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libmongocrypt",
"purl": "pkg:deb/ubuntu/libmongocrypt?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"1.17.0-1",
"1.19.0-1",
"1.19.1-1",
"1.20.0-1",
"1.20.1-1build1",
"1.20.2-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81523.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmongocrypt0",
"binary_version": "1.20.2-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libmongocrypt",
"purl": "pkg:deb/ubuntu/libmongocrypt?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1.13.2-1",
"1.17.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81523.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmongocrypt0",
"binary_version": "1.17.0-1"
}
]
}
}
],
"modified": "2026-10-17T13:01:10.504502438Z",
"provider": "osv",
"upstream": [
"CVE-2026-81523"
],
"references": [
"https://ubuntu.com/security/CVE-2026-81523",
"https://www.cve.org/CVERecord?id=CVE-2026-81523",
"https://jira.mongodb.org/browse/MONGOCRYPT-977",
"https://github.com/mongodb/libmongocrypt/releases/tag/1.20.3"
]
},
"related_cves": [
{
"value": "CVE-2026-81523",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361133,
"published_at": "2026-08-27T20:18:00+00:00"
}