High
libmongocrypt — security advisory
An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.
- 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-2026-106429
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:58 UTC · Revision 1
Source evidence
An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.
osv:UBUNTU-CVE-2026-106429
libmongocrypt
Fixed versions: Not specified
libmongocrypt
Fixed versions: Not specified
libmongocrypt
Fixed versions: Not specified
libmongocrypt
Fixed versions: Not specified
Complete source record
{
"id": "e342a110077d0729258ad02bf78653753064b30d99489a8bd339be18103b6f92",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-106429",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-106429",
"summary": "An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.",
"evidence": "osv:UBUNTU-CVE-2026-106429",
"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": {
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},
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"affected_versions": [
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{
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{
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{
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{
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{
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"affected_versions": [
{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
},
{
"value": "1.19.1-1",
"evidence": "/affected/2/versions"
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{
"value": "1.20.0-1",
"evidence": "/affected/2/versions"
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{
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{
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},
{
"name": {
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"evidence": "/affected/3/package/name"
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"prerequisites": [],
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"affected_versions": [
{
"value": "1.13.2-1",
"evidence": "/affected/3/versions"
},
{
"value": "1.17.0-1",
"evidence": "/affected/3/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-106429",
"aliases": [
"UBUNTU-CVE-2026-106429"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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": {
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"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-2026-106429.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmongocrypt0",
"binary_version": "1.3.0-1ubuntu1"
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},
{
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"package": {
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},
"ecosystem_specific": {
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{
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"package": {
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"purl": "pkg:deb/ubuntu/libmongocrypt?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
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"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-2026-106429.json"
},
"ecosystem_specific": {
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{
"binary_name": "libmongocrypt0",
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}
]
}
},
{
"ranges": [
{
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],
"package": {
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"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": {
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},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmongocrypt0",
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]
}
}
],
"modified": "2026-10-17T12:58:00.453455518Z",
"provider": "osv",
"upstream": [
"CVE-2026-106429"
],
"references": [
"https://ubuntu.com/security/CVE-2026-106429",
"https://www.cve.org/CVERecord?id=CVE-2026-106429",
"https://jira.mongodb.org/browse/MONGOCRYPT-986"
]
},
"related_cves": [
{
"value": "CVE-2026-106429",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 357858,
"published_at": "2026-10-08T19:16:00+00:00"
}