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Apache MINA SSHD EUVDEUVD-2026-89758

| CVE-2026-93994 HIGH
Missing Critical Step in Authentication (CWE-304)
2026-09-29 GHSA-qc4p-9828-mv83
Authentication Bypass Apache Java SSH Red Hat Suse
8.1
CVSS 3.1 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
8.1 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
vuln.today AI
8.1 HIGH

Network-reachable SSH with low complexity; PR:L because the attacker must hold one legitimate key of the required pair; C:H/I:H from full session access, A:N as no availability impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
8.1 HIGH
qualitative

Primary rating from Vendor (CNA).

CVSS VectorVendor

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

4
Patch available
Sep 30, 2026 - 11:01 EUVD
CVSS changed
Sep 30, 2026 - 10:22 NVD
8.1 (HIGH)
Analysis Generated
Sep 29, 2026 - 20:17 vuln.today
CVE Published
Sep 29, 2026 - 18:18 oss-security
HIGH

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

Articles & Coverage 1

News 14 New Java Vulnerabilities - 4 Critical, 10 High Severity Sep 30, 2026

AnalysisAI

A partial authentication bypass in Apache MINA SSHD lets a remote attacker satisfy a repeated-public-key multi-authentication policy by presenting the same public key twice, so a server configured to demand two distinct keys can be entered with only one of them. Affected are versions before 2.20.0 and 3.0.0-M1 through 3.0.0-M5 of the sshd-core component; the vendor assigns CVSS 3.1 8.1 (High, CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N), where PR:L reflects that the attacker must already legitimately possess at least one accepted key pair. …

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Attack ChainAIDerived

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Vulnerability AssessmentAI

Exploitation Exploitation requires the server to be configured for multi-step public-key authentication (equivalent to OpenSSH's AuthenticationMethods "publickey,publickey"), where two distinct public keys are demanded; single-key or password-based deployments are NOT affected. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-supplied CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N, base 8.1 High) is internally consistent with the described flaw: a network-reachable server, low attack complexity, and required low privileges (PR:L) because the attacker must legitimately possess ONE of the two key pairs demanded by a multi-authentication policy. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to the vendor-released fixed versions: Apache MINA SSHD 2.20.0 (2.x line) or 3.0.0-M6 (3.x line), which enforce that the public keys presented across successive publickey steps are distinct (see https://mina.apache.org/ and https://seclists.org/oss-sec/2026/q3/1006). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all instances of Apache MINA SSHD sshd-core versions before 2.20.0 and 3.0.0-M1 through 3.0.0-M5, and identify any server configured with a repeated-public-key multi-authentication policy (e.g., AuthenticationMethods publickey,publickey). …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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EUVD-2026-89758 vulnerability details – vuln.today
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