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Apache MINA SSHD EUVDEUVD-2026-89731

| CVE-2026-94029 MEDIUM
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-09-29 GHSA-fj5v-qh2p-6v8f
Denial Of Service Apache Java SSH Red Hat Suse
6.5
CVSS 3.1 · Vendor
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Severity by source

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

Network-reachable SFTP extension exploitable with low complexity but requiring a valid account (PR:L); no confidentiality or integrity impact, only server memory exhaustion (A:H).

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

Primary rating from Vendor (CNA).

CVSS VectorVendor

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

Lifecycle Timeline

3
Patch available
Sep 30, 2026 - 10:02 EUVD
Analysis Generated
Sep 29, 2026 - 20:15 vuln.today
CVE Published
Sep 29, 2026 - 18:27 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

Memory exhaustion in the sshd-sftp component of Apache MINA SSHD (1.0.0 through 2.19.0 and 3.0.0-M1 through 3.0.0-M5) lets an authenticated remote SFTP client crash the server by driving the SFTP v6 check-file-name/check-file-handle extension to build an oversized reply entirely in server memory. Per the assessed vector (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H), the session must be authenticated and must negotiate SFTP protocol version 6, and the attacker must point the request at a very large (possibly sparse) file using a tiny block size such as the 256-byte minimum, so that file-size divided by block size yields an enormous number of hashes; availability impact is high while confidentiality and integrity are unaffected. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Requires an authenticated SFTP session (PR:L) against a server running Apache MINA SSHD 1.0.0-2.19.0 or 3.0.0-M1 to 3.0.0-M5 with the sshd-sftp component and SFTP protocol version 6 in use, since the flaw lives in the v6-specific check-file-name/check-file-handle extension. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine but bounded availability risk. … 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 Vendor-released patch: upgrade to Apache MINA SSHD 2.20.0 (for the 2.x line) or 3.0.0-M6 (for the 3.0.0 milestone line), which fix the issue by imposing a maximum limit on the size of the SFTP reply; both versions are published by the Apache MINA project at https://mina.apache.org/, and the oss-security advisory at https://seclists.org/oss-sec/2026/q3/1010 documents the change. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Apache MINA SSHD deployments and confirm whether any are running 1.0.0 through 2.19.0 or 3.0.0-M1 through 3.0.0-M5, identify which expose sftp/sshd-sftp to untrusted or broad authenticated user populations, and immediately restrict access to trusted users; where configuration permits, enforce an SFTP message-size cap of 256kB or lower and disable or restrict SFTP protocol v6 and the check-file-name/check-file-handle extensions, noting that deployments already capping SFTP message size, such as OpenSSH's typical 256kB limit, are not exposed. …

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Vendor StatusVendor

SUSE

Severity: Moderate
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-2026-89731 vulnerability details – vuln.today
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