Low
Cross-tenant database retargeting via dot/NUL injection in namespace strings in libmongocrypt
Type: advisorySources: OSV
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
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-81523
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 8 Nov 2026, 01:21 UTC · Revision 1
Source evidence
Cross-tenant database retargeting via dot/NUL injection in namespace strings in libmongocrypt
core-osv · Original sourcePublished 27 Aug 2026, 18:32 UTC
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:CVE-2026-81523
Complete source record
{
"id": "5283c0c716646b27319bc70ba4c74d81c03e84ea57a41ddde983df205803981c",
"url": "https://osv.dev/vulnerability/CVE-2026-81523",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Cross-tenant database retargeting via dot/NUL injection in namespace strings in libmongocrypt",
"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:CVE-2026-81523",
"products": [],
"severity": "low",
"structured": {
"id": "CVE-2026-81523",
"aliases": [
"CVE-2026-81523"
],
"metrics": [
{
"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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/mongodb/libmongocrypt",
"type": "GIT",
"events": [
{
"introduced": "db663b458b8680df9b81ff8cde7053633c155fb6"
},
{
"fixed": "f12c437858d25a06d55e0a14433d39ef3aa862f4"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "1.0.0"
},
{
"fixed": "1.20.3"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"fixed": "f12c437858d25a06d55e0a14433d39ef3aa862f4"
}
],
"source": "REFERENCES_TAG",
"original_tag": "1.20.3"
},
{
"cpe": "cpe:2.3:a:mongodb:libmongocrypt:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.20.3"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"1.20.2",
"1.20.1",
"1.20.0",
"pymongocrypt-1.18.1",
"pymongocrypt-1.18.0",
"pymongocrypt-1.18.0.dev0",
"pymongocrypt-1.17.0",
"pymongocrypt-1.16.0",
"pymongocrypt-1.15.1",
"pymongocrypt-1.15.0",
"pymongocrypt-1.14.1",
"pymongocrypt-1.14.0",
"pymongocrypt-1.13.0",
"pymongocrypt-1.12.2",
"pymongocrypt-1.12.2rc4",
"pymongocrypt-1.12.2rc2",
"pymongocrypt-1.12.2rc1",
"pymongocrypt-1.2.2rc0",
"pymongocrypt-1.12.1",
"pymongocrypt-1.12.0",
"pymongocrypt-1.11.0",
"java-1.11.0",
"csharp-v1.11.0",
"pymongocrypt-1.10.1",
"csharp-v1.10.0",
"pymongocrypt-1.10.0",
"1.10.0b1",
"1.10.0b0",
"pymongocrypt-1.9.1",
"node-v6.0.1",
"csharp-v1.9.0",
"pymongocrypt-1.9.0",
"csharp-v1.8.2",
"csharp-v1.8.1",
"pymongocrypt-1.8.0",
"node-v2.9.0",
"node-v6.0.0",
"node-v6.0.0-alpha.3",
"node-v6.0.0-alpha.2",
"pymongocrypt-1.7.0",
"pymongocrypt-1.6.1",
"csharp-v1.8.0",
"node-v2.8.0",
"pymongocrypt-1.6.0",
"1.8.0-alpha1",
"pymongocrypt-1.5.2",
"csharp-v1.8.0-alpha.0",
"java-1.8.0-alpha0",
"node-v2.8.0-alpha.0",
"1.8.0-alpha0",
"node-v2.7.1",
"node-v2.7.0",
"node-v2.7.0-alpha.0",
"node-v2.6.0",
"node-v2.6.0-alpha.0",
"pymongocrypt-1.5.1",
"node-v2.5.0",
"node-v2.4.0",
"pymongocrypt-1.5.0",
"node-v2.4.0-alpha.2",
"node-v2.4.0-alpha.1",
"csharp-v1.7.0",
"node-v2.4.0-alpha.0",
"1.7.0-alpha2",
"1.7.0-alpha1",
"pymongocrypt-1.4.1",
"1.7.0-alpha0",
"pymongocrypt-1.4.0",
"node-v2.3.0",
"node-v2.2.1",
"csharp-v1.6.0",
"node-v2.2.0",
"java-1.6.0-alpha0",
"1.6.0-alpha0",
"csharp-v1.5.5",
"pymongocrypt-1.3.1",
"node-v2.2.0-alpha.6",
"node-v2.2.0-alpha.5",
"pymongocrypt-1.3.0",
"csharp-v1.5.4",
"node-v2.2.0-alpha.4",
"node-v2.2.0-alpha.3",
"csharp-v1.5.2",
"1.5.0-rc2",
"node-v2.2.0-alpha.2",
"pymongocrypt-1.3.0b0",
"1.5.0-rc1",
"csharp-v1.5.1",
"csharp-v1.5.0",
"node-v2.2.0-alpha.1",
"1.5.0-rc0",
"1.5.0-alpha2",
"node-v2.2.0-alpha.0",
"1.5.0-alpha1",
"1.5.0-alpha0",
"node-v2.1.0",
"1.3.1",
"1.4.0-alpha0",
"node-v2.0.0",
"node-v2.0.0-beta.4",
"node-v2.0.0-beta.3",
"csharp-v1.3.0",
"pymongocrypt-1.2.0",
"pymongocrypt-1.1.2",
"1.3.0",
"1.3.0-beta1",
"node-v2.0.0-beta.0",
"node-v1.2.7",
"1.2.2",
"csharp-v1.2.3",
"csharp-v1.2.2",
"pymongocrypt-1.1.1",
"1.2.1",
"node-v1.2.6",
"node-v1.2.5",
"node-v1.2.4",
"node-v1.2.3",
"node-v1.2.2",
"1.2.0",
"pymongocrypt-1.1.0",
"node-v1.2.1",
"node-v1.2.0",
"csharp-v1.2.1",
"csharp-v1.2.0",
"debian/1.1.0-1",
"1.1.0",
"csharp-v1.1.0-beta04",
"csharp-v1.1.0-beta03",
"pymongocrypt-1.1.0b0",
"csharp-v1.1.0-beta02",
"csharp-v1.1.0-beta01",
"1.1.0-beta1",
"1.0.4",
"pymongocrypt-1.0.1",
"node-v1.1.0",
"1.0.3",
"1.0.2",
"1.0.1",
"1.0.1-rc0",
"node-v1.0.1",
"node-v1.0.0",
"pymongocrypt-1.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81523.json"
}
}
],
"modified": "2026-10-28T02:30:52.477081192Z",
"provider": "osv",
"references": [
"https://github.com/mongodb/libmongocrypt/releases/tag/1.20.3",
"https://jira.mongodb.org/browse/MONGOCRYPT-977",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81523.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-81523"
],
"provider_metadata": {
"cwe_ids": [
"CWE-74"
],
"cna_assigner": "mongodb",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81523.json"
}
},
"related_cves": [
{
"value": "CVE-2026-81523",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 521298,
"published_at": "2026-08-27T18:32:24.206+00:00"
}