OESA-2026-1963 (CVE-2026-3497)

Vulnerability from osv_openeuler – Published: 2026-04-17 11:10 – Updated: 2026-08-06 11:10 – Source website
VLAI
Summary
openssh security update
Details

An open source implementation of SSH protocol version 2

Security Fix(es):

Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects the GSSAPI patches added by various Linux distributions and does not affect the OpenSSH upstream project itself. The usage of sshpkt_disconnect() on an error, which does not terminate the process, allows an attacker to send an unexpected GSSAPI message type during the GSSAPI key exchange to the server, which will call the underlying function and continue the execution of the program without setting the related connection variables. As the variables are not initialized to NULL the code later accesses those uninitialized variables, accessing random memory, which could lead to undefined behavior. The recommended workaround is to use ssh_packet_disconnect() instead, which does terminate the process. The impact of the vulnerability depends heavily on the compiler flag hardening configuration.(CVE-2026-3497)

In OpenSSH before 10.3, a file downloaded by scp may be installed setuid or setgid, an outcome contrary to some users' expectations, if the download is performed as root with -O (legacy scp protocol) and without -p (preserve mode).(CVE-2026-35385)

In OpenSSH before 10.3, command execution can occur via shell metacharacters in a username within a command line. This requires a scenario where the username on the command line is untrusted, and also requires a non-default configurations of % in ssh_config.(CVE-2026-35386)

OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms.(CVE-2026-35387)

OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.(CVE-2026-35388)

OpenSSH before 10.3 mishandles the authorized_keys principals option in uncommon scenarios involving a principals list in conjunction with a Certificate Authority that makes certain use of comma characters.(CVE-2026-35414)

Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "openssh-9.6p1-13.oe2403sp1.aarch64.rpm",
          "openssh-askpass-9.6p1-13.oe2403sp1.aarch64.rpm",
          "openssh-clients-9.6p1-13.oe2403sp1.aarch64.rpm",
          "openssh-debuginfo-9.6p1-13.oe2403sp1.aarch64.rpm",
          "openssh-debugsource-9.6p1-13.oe2403sp1.aarch64.rpm",
          "openssh-keycat-9.6p1-13.oe2403sp1.aarch64.rpm",
          "openssh-server-9.6p1-13.oe2403sp1.aarch64.rpm",
          "pam_ssh_agent_auth-0.10.4-5.13.oe2403sp1.aarch64.rpm"
        ],
        "noarch": [
          "openssh-help-9.6p1-13.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "openssh-9.6p1-13.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "openssh-9.6p1-13.oe2403sp1.x86_64.rpm",
          "openssh-askpass-9.6p1-13.oe2403sp1.x86_64.rpm",
          "openssh-clients-9.6p1-13.oe2403sp1.x86_64.rpm",
          "openssh-debuginfo-9.6p1-13.oe2403sp1.x86_64.rpm",
          "openssh-debugsource-9.6p1-13.oe2403sp1.x86_64.rpm",
          "openssh-keycat-9.6p1-13.oe2403sp1.x86_64.rpm",
          "openssh-server-9.6p1-13.oe2403sp1.x86_64.rpm",
          "pam_ssh_agent_auth-0.10.4-5.13.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "openssh",
        "purl": "pkg:rpm/openEuler/openssh\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.6p1-13.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
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      "ecosystem_specific": {
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          "openssh-keycat-9.6p1-13.oe2403sp2.aarch64.rpm",
          "openssh-server-9.6p1-13.oe2403sp2.aarch64.rpm",
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        ],
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        ],
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          "openssh-askpass-9.6p1-13.oe2403sp2.x86_64.rpm",
          "openssh-clients-9.6p1-13.oe2403sp2.x86_64.rpm",
          "openssh-debuginfo-9.6p1-13.oe2403sp2.x86_64.rpm",
          "openssh-debugsource-9.6p1-13.oe2403sp2.x86_64.rpm",
          "openssh-keycat-9.6p1-13.oe2403sp2.x86_64.rpm",
          "openssh-server-9.6p1-13.oe2403sp2.x86_64.rpm",
          "pam_ssh_agent_auth-0.10.4-5.13.oe2403sp2.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP2",
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        "purl": "pkg:rpm/openEuler/openssh\u0026distro=openEuler-24.03-LTS-SP2"
      },
      "ranges": [
        {
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              "introduced": "0"
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            {
              "fixed": "9.6p1-13.oe2403sp2"
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          "type": "ECOSYSTEM"
        }
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    },
    {
      "ecosystem_specific": {
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          "openssh-debugsource-9.6p1-13.oe2403sp3.aarch64.rpm",
          "openssh-keycat-9.6p1-13.oe2403sp3.aarch64.rpm",
          "openssh-server-9.6p1-13.oe2403sp3.aarch64.rpm",
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        ],
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        "x86_64": [
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          "openssh-askpass-9.6p1-13.oe2403sp3.x86_64.rpm",
          "openssh-clients-9.6p1-13.oe2403sp3.x86_64.rpm",
          "openssh-debuginfo-9.6p1-13.oe2403sp3.x86_64.rpm",
          "openssh-debugsource-9.6p1-13.oe2403sp3.x86_64.rpm",
          "openssh-keycat-9.6p1-13.oe2403sp3.x86_64.rpm",
          "openssh-server-9.6p1-13.oe2403sp3.x86_64.rpm",
          "pam_ssh_agent_auth-0.10.4-5.13.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "openssh",
        "purl": "pkg:rpm/openEuler/openssh\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
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          "openssh-askpass-8.2p1-35.oe2003sp4.aarch64.rpm",
          "openssh-cavs-8.2p1-35.oe2003sp4.aarch64.rpm",
          "openssh-clients-8.2p1-35.oe2003sp4.aarch64.rpm",
          "openssh-debuginfo-8.2p1-35.oe2003sp4.aarch64.rpm",
          "openssh-debugsource-8.2p1-35.oe2003sp4.aarch64.rpm",
          "openssh-keycat-8.2p1-35.oe2003sp4.aarch64.rpm",
          "openssh-ldap-8.2p1-35.oe2003sp4.aarch64.rpm",
          "openssh-server-8.2p1-35.oe2003sp4.aarch64.rpm",
          "pam_ssh_agent_auth-0.10.3-9.35.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "openssh-help-8.2p1-35.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "openssh-8.2p1-35.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "openssh-8.2p1-35.oe2003sp4.x86_64.rpm",
          "openssh-askpass-8.2p1-35.oe2003sp4.x86_64.rpm",
          "openssh-cavs-8.2p1-35.oe2003sp4.x86_64.rpm",
          "openssh-clients-8.2p1-35.oe2003sp4.x86_64.rpm",
          "openssh-debuginfo-8.2p1-35.oe2003sp4.x86_64.rpm",
          "openssh-debugsource-8.2p1-35.oe2003sp4.x86_64.rpm",
          "openssh-keycat-8.2p1-35.oe2003sp4.x86_64.rpm",
          "openssh-ldap-8.2p1-35.oe2003sp4.x86_64.rpm",
          "openssh-server-8.2p1-35.oe2003sp4.x86_64.rpm",
          "pam_ssh_agent_auth-0.10.3-9.35.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "openssh",
        "purl": "pkg:rpm/openEuler/openssh\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
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            {
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          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
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          "openssh-askpass-8.8p1-41.oe2203sp4.aarch64.rpm",
          "openssh-clients-8.8p1-41.oe2203sp4.aarch64.rpm",
          "openssh-debuginfo-8.8p1-41.oe2203sp4.aarch64.rpm",
          "openssh-debugsource-8.8p1-41.oe2203sp4.aarch64.rpm",
          "openssh-keycat-8.8p1-41.oe2203sp4.aarch64.rpm",
          "openssh-server-8.8p1-41.oe2203sp4.aarch64.rpm",
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        ],
        "x86_64": [
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          "openssh-askpass-8.8p1-41.oe2203sp4.x86_64.rpm",
          "openssh-clients-8.8p1-41.oe2203sp4.x86_64.rpm",
          "openssh-debuginfo-8.8p1-41.oe2203sp4.x86_64.rpm",
          "openssh-debugsource-8.8p1-41.oe2203sp4.x86_64.rpm",
          "openssh-keycat-8.8p1-41.oe2203sp4.x86_64.rpm",
          "openssh-server-8.8p1-41.oe2203sp4.x86_64.rpm",
          "pam_ssh_agent_auth-0.10.4-4.41.oe2203sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "openssh",
        "purl": "pkg:rpm/openEuler/openssh\u0026distro=openEuler-22.03-LTS-SP4"
      },
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        {
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            {
              "introduced": "0"
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            {
              "fixed": "8.8p1-41.oe2203sp4"
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          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
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          "openssh-askpass-9.6p1-13.oe2403sp1.aarch64.rpm",
          "openssh-clients-9.6p1-13.oe2403sp1.aarch64.rpm",
          "openssh-debuginfo-9.6p1-13.oe2403sp1.aarch64.rpm",
          "openssh-debugsource-9.6p1-13.oe2403sp1.aarch64.rpm",
          "openssh-keycat-9.6p1-13.oe2403sp1.aarch64.rpm",
          "openssh-server-9.6p1-13.oe2403sp1.aarch64.rpm",
          "pam_ssh_agent_auth-0.10.4-5.13.oe2403sp1.aarch64.rpm",
          "openssh-9.6p1-13.oe2403sp2.aarch64.rpm",
          "openssh-askpass-9.6p1-13.oe2403sp2.aarch64.rpm",
          "openssh-clients-9.6p1-13.oe2403sp2.aarch64.rpm",
          "openssh-debuginfo-9.6p1-13.oe2403sp2.aarch64.rpm",
          "openssh-debugsource-9.6p1-13.oe2403sp2.aarch64.rpm",
          "openssh-keycat-9.6p1-13.oe2403sp2.aarch64.rpm",
          "openssh-server-9.6p1-13.oe2403sp2.aarch64.rpm",
          "pam_ssh_agent_auth-0.10.4-5.13.oe2403sp2.aarch64.rpm",
          "openssh-9.6p1-13.oe2403sp3.aarch64.rpm",
          "openssh-askpass-9.6p1-13.oe2403sp3.aarch64.rpm",
          "openssh-clients-9.6p1-13.oe2403sp3.aarch64.rpm",
          "openssh-debuginfo-9.6p1-13.oe2403sp3.aarch64.rpm",
          "openssh-debugsource-9.6p1-13.oe2403sp3.aarch64.rpm",
          "openssh-keycat-9.6p1-13.oe2403sp3.aarch64.rpm",
          "openssh-server-9.6p1-13.oe2403sp3.aarch64.rpm",
          "pam_ssh_agent_auth-0.10.4-5.13.oe2403sp3.aarch64.rpm",
          "openssh-9.3p2-11.oe2403.aarch64.rpm",
          "openssh-askpass-9.3p2-11.oe2403.aarch64.rpm",
          "openssh-clients-9.3p2-11.oe2403.aarch64.rpm",
          "openssh-debuginfo-9.3p2-11.oe2403.aarch64.rpm",
          "openssh-debugsource-9.3p2-11.oe2403.aarch64.rpm",
          "openssh-keycat-9.3p2-11.oe2403.aarch64.rpm",
          "openssh-server-9.3p2-11.oe2403.aarch64.rpm",
          "pam_ssh_agent_auth-0.10.4-4.11.oe2403.aarch64.rpm"
        ],
        "noarch": [
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          "openssh-help-9.6p1-13.oe2403sp2.noarch.rpm",
          "openssh-help-9.6p1-13.oe2403sp3.noarch.rpm",
          "openssh-help-9.3p2-11.oe2403.noarch.rpm"
        ],
        "src": [
          "openssh-9.6p1-13.oe2403sp1.src.rpm",
          "openssh-9.6p1-13.oe2403sp2.src.rpm",
          "openssh-9.6p1-13.oe2403sp3.src.rpm",
          "openssh-9.3p2-11.oe2403.src.rpm"
        ],
        "x86_64": [
          "openssh-9.6p1-13.oe2403sp1.x86_64.rpm",
          "openssh-askpass-9.6p1-13.oe2403sp1.x86_64.rpm",
          "openssh-clients-9.6p1-13.oe2403sp1.x86_64.rpm",
          "openssh-debuginfo-9.6p1-13.oe2403sp1.x86_64.rpm",
          "openssh-debugsource-9.6p1-13.oe2403sp1.x86_64.rpm",
          "openssh-keycat-9.6p1-13.oe2403sp1.x86_64.rpm",
          "openssh-server-9.6p1-13.oe2403sp1.x86_64.rpm",
          "pam_ssh_agent_auth-0.10.4-5.13.oe2403sp1.x86_64.rpm",
          "openssh-9.6p1-13.oe2403sp2.x86_64.rpm",
          "openssh-askpass-9.6p1-13.oe2403sp2.x86_64.rpm",
          "openssh-clients-9.6p1-13.oe2403sp2.x86_64.rpm",
          "openssh-debuginfo-9.6p1-13.oe2403sp2.x86_64.rpm",
          "openssh-debugsource-9.6p1-13.oe2403sp2.x86_64.rpm",
          "openssh-keycat-9.6p1-13.oe2403sp2.x86_64.rpm",
          "openssh-server-9.6p1-13.oe2403sp2.x86_64.rpm",
          "pam_ssh_agent_auth-0.10.4-5.13.oe2403sp2.x86_64.rpm",
          "openssh-9.6p1-13.oe2403sp3.x86_64.rpm",
          "openssh-askpass-9.6p1-13.oe2403sp3.x86_64.rpm",
          "openssh-clients-9.6p1-13.oe2403sp3.x86_64.rpm",
          "openssh-debuginfo-9.6p1-13.oe2403sp3.x86_64.rpm",
          "openssh-debugsource-9.6p1-13.oe2403sp3.x86_64.rpm",
          "openssh-keycat-9.6p1-13.oe2403sp3.x86_64.rpm",
          "openssh-server-9.6p1-13.oe2403sp3.x86_64.rpm",
          "pam_ssh_agent_auth-0.10.4-5.13.oe2403sp3.x86_64.rpm",
          "openssh-9.3p2-11.oe2403.x86_64.rpm",
          "openssh-askpass-9.3p2-11.oe2403.x86_64.rpm",
          "openssh-clients-9.3p2-11.oe2403.x86_64.rpm",
          "openssh-debuginfo-9.3p2-11.oe2403.x86_64.rpm",
          "openssh-debugsource-9.3p2-11.oe2403.x86_64.rpm",
          "openssh-keycat-9.3p2-11.oe2403.x86_64.rpm",
          "openssh-server-9.3p2-11.oe2403.x86_64.rpm",
          "pam_ssh_agent_auth-0.10.4-4.11.oe2403.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS",
        "name": "openssh",
        "purl": "pkg:rpm/openEuler/openssh\u0026distro=openEuler-24.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.3p2-11.oe2403"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "An open source implementation of SSH protocol version 2\r\n\r\nSecurity Fix(es):\n\nVulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects the GSSAPI patches added by various Linux distributions and does not affect the OpenSSH upstream project itself. The usage of sshpkt_disconnect() on an error, which does not terminate the process, allows an attacker to send an unexpected GSSAPI message type during the GSSAPI key exchange to the server, which will call the underlying function and continue the execution of the program without setting the related connection variables. As the variables are not initialized to NULL the code later accesses those uninitialized variables, accessing random memory, which could lead to undefined behavior. The recommended workaround is to use ssh_packet_disconnect() instead, which does terminate the process. The impact of the vulnerability depends heavily on the compiler flag hardening configuration.(CVE-2026-3497)\n\nIn OpenSSH before 10.3, a file downloaded by scp may be installed setuid or setgid, an outcome contrary to some users\u0026apos; expectations, if the download is performed as root with -O (legacy scp protocol) and without -p (preserve mode).(CVE-2026-35385)\n\nIn OpenSSH before 10.3, command execution can occur via shell metacharacters in a username within a command line. This requires a scenario where the username on the command line is untrusted, and also requires a non-default configurations of % in ssh_config.(CVE-2026-35386)\n\nOpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms.(CVE-2026-35387)\n\nOpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.(CVE-2026-35388)\n\nOpenSSH before 10.3 mishandles the authorized_keys principals option in uncommon scenarios involving a principals list in conjunction with a Certificate Authority that makes certain use of comma characters.(CVE-2026-35414)",
  "id": "OESA-2026-1963",
  "modified": "2026-08-06T11:10:58Z",
  "published": "2026-04-17T11:10:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1963"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3497"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35385"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35386"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35387"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35388"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35414"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "openssh security update",
  "upstream": [
    "CVE-2026-3497",
    "CVE-2026-35385",
    "CVE-2026-35386",
    "CVE-2026-35387",
    "CVE-2026-35388",
    "CVE-2026-35414"
  ]
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.



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.