MediumFix available
libmongocrypt — security advisory
The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.
- Products
- libmongocrypt
- Affected versions
- 1.10.0-1, 1.10.1-1, 1.11.0-1, 1.12.0-1, 1.13.0-1, 1.13.1-1, 1.13.2-1, 1.13.2-1+deb13u1, 1.16.0-1, 1.17.0-1, 1.17.3-1, 1.18.1-1, 1.18.2-1, 1.19.0-1, 1.19.1-1, 1.20.0-1, 1.20.1-1, 1.20.2-1, 1.20.3-1, 1.20.4-1, 1.20.5-1, 1.7.2-1, 1.8.2-1, 1.8.4-1, 1.9.1-1
- Fixed versions
- 1.20.5-1
- CVEs
- CVE-2026-106434
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 11:45 UTC · Revision 1
Source evidence
The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.
osv:DEBIAN-CVE-2026-106434
libmongocrypt
Fixed versions: Not specified
libmongocrypt
Fixed versions: Not specified
libmongocrypt
Fixed versions: 1.20.5-1
Complete source record
{
"id": "c1477cbcf889b4162e0bad39d633c87a1b08ba8e996247dd1ab0a7771aefc864",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-106434",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-106434",
"summary": "The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.",
"evidence": "osv:DEBIAN-CVE-2026-106434",
"products": [
{
"name": {
"value": "libmongocrypt",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.10.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.10.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.11.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.12.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.13.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.13.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.13.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.16.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.17.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.17.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.18.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.18.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.19.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.19.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.20.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.20.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.20.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.20.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.20.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.20.5-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.7.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.9.1-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "libmongocrypt",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.13.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.13.2-1+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1.16.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.17.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.17.3-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.18.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.18.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.19.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.19.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.20.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.20.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.20.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.20.3-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.20.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.20.5-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "libmongocrypt",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.20.5-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1.13.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.16.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.17.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.17.3-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.18.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.18.2-1",
"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": "1.20.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.20.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.20.3-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.20.4-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-106434",
"aliases": [
"DEBIAN-CVE-2026-106434"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/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": "libmongocrypt",
"purl": "pkg:deb/debian/libmongocrypt?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.10.0-1",
"1.10.1-1",
"1.11.0-1",
"1.12.0-1",
"1.13.0-1",
"1.13.1-1",
"1.13.2-1",
"1.16.0-1",
"1.17.0-1",
"1.17.3-1",
"1.18.1-1",
"1.18.2-1",
"1.19.0-1",
"1.19.1-1",
"1.20.0-1",
"1.20.1-1",
"1.20.2-1",
"1.20.3-1",
"1.20.4-1",
"1.20.5-1",
"1.7.2-1",
"1.8.2-1",
"1.8.4-1",
"1.9.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-106434.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libmongocrypt",
"purl": "pkg:deb/debian/libmongocrypt?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.13.2-1",
"1.13.2-1+deb13u1",
"1.16.0-1",
"1.17.0-1",
"1.17.3-1",
"1.18.1-1",
"1.18.2-1",
"1.19.0-1",
"1.19.1-1",
"1.20.0-1",
"1.20.1-1",
"1.20.2-1",
"1.20.3-1",
"1.20.4-1",
"1.20.5-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-106434.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.20.5-1"
}
]
}
],
"package": {
"name": "libmongocrypt",
"purl": "pkg:deb/debian/libmongocrypt?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.13.2-1",
"1.16.0-1",
"1.17.0-1",
"1.17.3-1",
"1.18.1-1",
"1.18.2-1",
"1.19.0-1",
"1.19.1-1",
"1.20.0-1",
"1.20.1-1",
"1.20.2-1",
"1.20.3-1",
"1.20.4-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-106434.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-14T06:00:08.069746228Z",
"provider": "osv",
"upstream": [
"CVE-2026-106434"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-106434"
]
},
"related_cves": [
{
"value": "CVE-2026-106434",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 315274,
"published_at": "2026-10-08T19:16:59.39+00:00"
}