Vulnerability-Lookup

RHSA-2026:71541

Vulnerability from csaf_redhat - Published: 2026-09-24 09:22 - Updated: 2026-10-01 17:38

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Important

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: maven3.9: * maven3.9-3.9.16-0.3.hum1 (noarch) * maven3.9-lib-3.9.16-0.3.hum1 (noarch) * maven3.9-3.9.16-0.3.hum1.src (src)

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-93994

A flaw was found in Apache MINA SSHD. When the server is configured to require multiple Secure Shell (SSH) public keys for authentication, it fails to verify that the submitted keys are distinct. A remote user can exploit this flaw by presenting the same public key twice to satisfy multi-key authentication requirements. This flaw results in an authentication bypass, allowing an attacker to gain unauthorized access using fewer credentials than mandated by the security policy.

8.1 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CWE-303 - Incorrect Implementation of Authentication Algorithm

Affected products

Fixed 5 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:maven3.9-0:3.9.16-0.3.hum1@noarch@public-hummingbird-aarch64-rpms	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:maven3.9-0:3.9.16-0.3.hum1@noarch@public-hummingbird-x86_64-rpms	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:maven3.9-0:3.9.16-0.3.hum1@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:maven3.9-lib-0:3.9.16-0.3.hum1@noarch@public-hummingbird-aarch64-rpms	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:maven3.9-lib-0:3.9.16-0.3.hum1@noarch@public-hummingbird-x86_64-rpms	—	Vendor Fix fix Workaround

Threats

Impact Important

References

11 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:71541	self
https://images.redhat.com/	external
https://access.redhat.com/security/cve/CVE-2026-93994	external
https://access.redhat.com/security/updates/classi…	external
https://access.redhat.com/security/cve/CVE-2026-77185	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-93994	self
https://bugzilla.redhat.com/show_bug.cgi?id=2543862	external
https://www.cve.org/CVERecord?id=CVE-2026-93994	external
https://nvd.nist.gov/vuln/detail/CVE-2026-93994	external
https://lists.apache.org/thread.html/9t3vsm8rnvwd…	external

JSON

To clipboard

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        "name": "Incorrect Implementation of Authentication Algorithm"
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      "discovery_date": "2026-09-30T10:02:22.779472+00:00",
      "ids": [
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          "text": "2543862"
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          "category": "description",
          "text": "A flaw was found in Apache MINA SSHD. When the server is configured to require multiple Secure Shell (SSH) public keys for authentication, it fails to verify that the submitted keys are distinct. A remote user can exploit this flaw by presenting the same public key twice to satisfy multi-key authentication requirements. This flaw results in an authentication bypass, allowing an attacker to gain unauthorized access using fewer credentials than mandated by the security policy.",
          "title": "Vulnerability description"
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        {
          "category": "summary",
          "text": "org.apache.sshd/sshd-core: Apache MINA SSHD: Authentication bypass via duplicate public key presentation",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A flaw was found in Apache MINA SSHD\u0027s authentication implementation in the sshd-core component. When an SSH server is configured to require multi-factor authentication using two different public keys (configured as AuthenticationMethods \"publickey,publickey\" in OpenSSH or equivalent in Apache MINA SSHD), the server does not validate that the two public keys presented during authentication are actually different. An attacker who possesses one valid SSH key authorized for an account can successfully authenticate by presenting the same key twice, bypassing the requirement for a second key. This is a partial authentication bypass that completely negates the security benefit of multi-key authentication configurations. \n  \nRed Hat ships vulnerable versions of Apache MINA SSHD in JBoss EAP 7/8/XP, JBoss Fuse 7 (Extended Lifecycle Support), Red Hat SSO 7, OpenShift Tools 4.x, Red Hat build of Apache Camel (Quarkus and Spring Boot variants), and RHEL-based Java packages. Fixed version 2.20.0 is available, which addresses this issue by enforcing that two distinct public keys must be presented for multi-key authentication.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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          "Red Hat Hardened Images:maven3.9-0:3.9.16-0.3.hum1@noarch@public-hummingbird-x86_64-rpms",
          "Red Hat Hardened Images:maven3.9-0:3.9.16-0.3.hum1@src",
          "Red Hat Hardened Images:maven3.9-lib-0:3.9.16-0.3.hum1@noarch@public-hummingbird-aarch64-rpms",
          "Red Hat Hardened Images:maven3.9-lib-0:3.9.16-0.3.hum1@noarch@public-hummingbird-x86_64-rpms"
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      },
      "references": [
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-93994"
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          "category": "external",
          "summary": "RHBZ#2543862",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543862"
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-93994",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-93994"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-93994",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93994"
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        {
          "category": "external",
          "summary": "https://lists.apache.org/thread.html/9t3vsm8rnvwdv9779mlg1lq2fbwojdwp",
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      "release_date": "2026-09-30T09:45:32.561000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-24T09:22:28+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
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            "Red Hat Hardened Images:maven3.9-0:3.9.16-0.3.hum1@src",
            "Red Hat Hardened Images:maven3.9-lib-0:3.9.16-0.3.hum1@noarch@public-hummingbird-aarch64-rpms",
            "Red Hat Hardened Images:maven3.9-lib-0:3.9.16-0.3.hum1@noarch@public-hummingbird-x86_64-rpms"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:71541"
        },
        {
          "category": "workaround",
          "details": "There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams. As a temporary workaround, if using Apache MINA SSHD with multi-key authentication configured, consider implementing additional authentication mechanisms (password, OTP) or restricting SSH access to trusted networks until patches are applied.",
          "product_ids": [
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            "Red Hat Hardened Images:maven3.9-0:3.9.16-0.3.hum1@noarch@public-hummingbird-x86_64-rpms",
            "Red Hat Hardened Images:maven3.9-0:3.9.16-0.3.hum1@src",
            "Red Hat Hardened Images:maven3.9-lib-0:3.9.16-0.3.hum1@noarch@public-hummingbird-aarch64-rpms",
            "Red Hat Hardened Images:maven3.9-lib-0:3.9.16-0.3.hum1@noarch@public-hummingbird-x86_64-rpms"
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        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
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            "Red Hat Hardened Images:maven3.9-0:3.9.16-0.3.hum1@noarch@public-hummingbird-x86_64-rpms",
            "Red Hat Hardened Images:maven3.9-0:3.9.16-0.3.hum1@src",
            "Red Hat Hardened Images:maven3.9-lib-0:3.9.16-0.3.hum1@noarch@public-hummingbird-aarch64-rpms",
            "Red Hat Hardened Images:maven3.9-lib-0:3.9.16-0.3.hum1@noarch@public-hummingbird-x86_64-rpms"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "org.apache.sshd/sshd-core: Apache MINA SSHD: Authentication bypass via duplicate public key presentation"
    }
  ]
}

CVE-2026-93994 (GCVE-0-2026-93994)

Vulnerability from cvelistv5 – Published: 2026-09-30 09:45 – Updated: 2026-09-30 14:29

Title

Apache MINA SSHD: Repeated-publickey policy bypass on server

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.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-30 14:29 UTC

CWE

CWE-304 - Missing critical step in authentication

Assigner

apache mitre root Scorecard

References

2 references

URL	Tags
https://lists.apache.org/thread.html/9t3vsm8rnvwd…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache MINA SSHD	Affected: 0 , < 2.20.0 (maven) Affected: 3.0.0-M1 , < 3.0.0-M6 (maven)

Credits

Abhishek Kushwaha

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-93994",
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          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

RHSA-2026:71541

CVE-2026-93994 (GCVE-0-2026-93994)

Tags

Sightings

Nomenclature

Related by attack behaviour