High
mina, mina2 — security advisory
Apache MINA SSHD is a Java library for client-side and server-side SSH. SSH servers can be configured to require multi-authentication schemes, for instance two different public keys, not just one. In OpenSSH, this would be done by setting in sshd_config AuthenticationMethods "publickey,publickey". Apache MINA SSHD provides an equivalent configuration mechanism. In Apache MINA SSHD versions up to 2.19.0 and 3.0.0-M1 to 3.0.0-M5 the server code in component sshd-core does not enforce that the two public keys presented are different. A user can thus successfully authenticate with only one of the two key pairs required by presenting this single key twice. This is a partial authentication bypass. Users are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue.
- Products
- mina, mina2
- Affected versions
- 1.1.7.dfsg-11, 1.1.7.dfsg-12, 1.1.7.dfsg-13, 1.1.7.dfsg-13ubuntu1, 2.0.16-2, 2.0.19-2, 2.0.7+dfsg-2, 2.0.9-1, 2.0.9-2, 2.1.4-2, 2.1.5-1, 2.1.5-1ubuntu0.1~esm1, 2.2.1-3, 2.2.1-3ubuntu0.1~esm1, 2.2.1-4, 2.2.1-4ubuntu0.1~esm1, 2.2.1-4ubuntu1, 2.2.9-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-93994
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:33 UTC · Revision 1
Source evidence
Apache MINA SSHD is a Java library for client-side and server-side SSH. SSH servers can be configured to require multi-authentication schemes, for instance two different public keys, not just one. In OpenSSH, this would be done by setting in sshd_config AuthenticationMethods "publickey,publickey". Apache MINA SSHD provides an equivalent configuration mechanism. In Apache MINA SSHD versions up to 2.19.0 and 3.0.0-M1 to 3.0.0-M5 the server code in component sshd-core does not enforce that the two public keys presented are different. A user can thus successfully authenticate with only one of the two key pairs required by presenting this single key twice. This is a partial authentication bypass. Users are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue.
osv:UBUNTU-CVE-2026-93994
mina
Fixed versions: Not specified
mina2
Fixed versions: Not specified
mina
Fixed versions: Not specified
mina2
Fixed versions: Not specified
mina
Fixed versions: Not specified
mina2
Fixed versions: Not specified
mina
Fixed versions: Not specified
mina2
Fixed versions: Not specified
mina
Fixed versions: Not specified
mina2
Fixed versions: Not specified
mina2
Fixed versions: Not specified
mina2
Fixed versions: Not specified
Complete source record
{
"id": "1c490c6ad75e1dca0953a171adcfe8a7eb46652ed2e83ab43128a1c940d75587",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-93994",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-93994",
"summary": "Apache MINA SSHD is a Java library for client-side and server-side SSH. SSH servers can be configured to require multi-authentication schemes, for instance two different public keys, not just one. In OpenSSH, this would be done by setting in sshd_config AuthenticationMethods \"publickey,publickey\". Apache MINA SSHD provides an equivalent configuration mechanism. In Apache MINA SSHD versions up to 2.19.0 and 3.0.0-M1 to 3.0.0-M5 the server code in component sshd-core does not enforce that the two public keys presented are different. A user can thus successfully authenticate with only one of the two key pairs required by presenting this single key twice. This is a partial authentication bypass. Users are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue.",
"evidence": "osv:UBUNTU-CVE-2026-93994",
"products": [
{
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{
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{
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{
"name": {
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"evidence": "/affected/9/package/name"
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"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/9/versions"
},
{
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"evidence": "/affected/9/versions"
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]
},
{
"name": {
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"evidence": "/affected/10/package/name"
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"prerequisites": [],
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"affected_versions": [
{
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{
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"affected_versions": [
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},
{
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],
"severity": "high",
"structured": {
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"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
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"package": {
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"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
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],
"database_specific": {
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},
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},
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],
"modified": "2026-10-17T13:01:18.696698811Z",
"provider": "osv",
"upstream": [
"CVE-2026-93994"
],
"references": [
"https://ubuntu.com/security/CVE-2026-93994",
"https://www.cve.org/CVERecord?id=CVE-2026-93994",
"https://www.openwall.com/lists/oss-security/2026/09/29/33"
]
},
"related_cves": [
{
"value": "CVE-2026-93994",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361613,
"published_at": "2026-09-30T10:17:00+00:00"
}