High
mongo-c-driver — security advisory
A double free in the OpenSSL-based TLS certificate revocation checking path of the MongoDB C Driver can be reached by a TLS endpoint that the client already trusts. During the handshake, specially formed certificate data can cause the same heap object to be released twice. An unauthenticated party acting as the trusted endpoint may cause the connecting client application to terminate unexpectedly.
- 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-2026-84964
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:23 UTC · Revision 1
Source evidence
A double free in the OpenSSL-based TLS certificate revocation checking path of the MongoDB C Driver can be reached by a TLS endpoint that the client already trusts. During the handshake, specially formed certificate data can cause the same heap object to be released twice. An unauthenticated party acting as the trusted endpoint may cause the connecting client application to terminate unexpectedly.
osv:UBUNTU-CVE-2026-84964
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": "742e13ae955b52f4e970aeb89421675e873aa7b1ad2147bd38370a72f87f1202",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-84964",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-84964",
"summary": "A double free in the OpenSSL-based TLS certificate revocation checking path of the MongoDB C Driver can be reached by a TLS endpoint that the client already trusts. During the handshake, specially formed certificate data can cause the same heap object to be released twice. An unauthenticated party acting as the trusted endpoint may cause the connecting client application to terminate unexpectedly.",
"evidence": "osv:UBUNTU-CVE-2026-84964",
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{
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{
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{
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"severity": "high",
"structured": {
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"aliases": [
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],
"metrics": [
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"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
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"events": [
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],
"package": {
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},
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"database_specific": {
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},
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],
"modified": "2026-10-17T13:01:12.874530960Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-84964",
"https://www.cve.org/CVERecord?id=CVE-2026-84964",
"https://jira.mongodb.org/browse/CDRIVER-6409"
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"security_relevant": true,
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"source_id": "core-osv",
"document_id": 361262,
"published_at": "2026-09-03T16:18:00+00:00"
}