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Apache MINA SSHD EUVDEUVD-2026-89759

| CVE-2026-77185 CRITICAL
Authentication Bypass by Primary Weakness (CWE-305)
2026-09-29 GHSA-v223-2p4c-wp64
Authentication Bypass Apache Java Suse
9.1
CVSS 3.1 · Vendor
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Severity by source

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

Remote unauthenticated signature-check bypass yields full account access (C:H/I:H); no availability impact; PR:N because the flaw defeats authentication itself, though the vulnerable async code path must be server-configured.

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

Primary rating from Vendor (CNA).

CVSS VectorVendor

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
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
9.1 (CRITICAL)
Analysis Generated
Sep 29, 2026 - 20:17 vuln.today
CVE Published
Sep 29, 2026 - 18:16 oss-security
CRITICAL

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

An authentication bypass in Apache MINA SSHD's sshd-core library (versions 2.0.0 through 2.19.0 and 3.0.0-M1 through 3.0.0-M5) allows remote, unauthenticated attackers to skip signature verification during public-key or hostbased SSH authentication, potentially granting an attacker a valid session. The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N (9.1 critical) reflects high confidentiality and integrity impact, but exploitation is gated by a non-default precondition: the server operator must have written explicit custom code enabling the library's 'asynchronous authentication' mechanism and applied it to public-key or hostbased authentication. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitable ONLY against an Apache MINA SSHD server (versions 2.0.0-2.19.0 or 3.0.0-M1 to 3.0.0-M5) whose operator has written explicit custom code enabling the 'asynchronous authentication' mechanism AND applies it to public-key or hostbased authentication. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N, 9.1 critical) describes a fully remote, network-facing, unauthenticated authentication bypass with high confidentiality and integrity impact - on paper a top-tier priority. … 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 Apache MINA SSHD 2.20.0 (2.x line) or 3.0.0-M6 (3.0.0 milestone line), which correct the asynchronous-authentication logic error and refuse to combine asynchronous authentication with the public-key or hostbased schemes - in that case the SSH session is terminated and a log entry is written. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory every system and application that bundles Apache MINA SSHD sshd-core in the affected ranges (2.0.0 through 2.19.0, and 3.0.0-M1 through 3.0.0-M5) and determine whether any of them contains internally written custom code that enables the library's asynchronous authentication mechanism and applies it to public-key or hostbased authentication; deployments that use the library only with password or keyboard-interactive authentication, or that never enabled asynchronous authentication, are not exposed and should be documented as out of scope. …

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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-2026-89759 vulnerability details – vuln.today
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