{
  "id": "CVE-2026-123158",
  "url": "https://spydr.io/cve/CVE-2026-123158",
  "published": "2026-11-05T16:17:47.110Z",
  "modified": "2026-11-10T13:48:52.110Z",
  "score": 8.1,
  "severity": "high",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "score_source": "mitre.org",
  "epss": 0.16501,
  "epss_percentile": 0.97016,
  "exploited": true,
  "kev": {
    "added": "2026-11-09",
    "due": "2026-11-12",
    "action": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
    "ransomware": "Unknown",
    "name": "OpenBSD OpenSSH Unexpected Status Code or Return Value Vulnerability",
    "notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://www.openssh.org/releasenotes.html ; https://alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass/ ; https://github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-123158"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "OpenBSD"
  ],
  "products": [
    "OpenBSD OpenSSH"
  ],
  "cwes": [
    "CWE-394"
  ],
  "description": "sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (related to misinterpretation of whether a string is intended to be a password hash). For some configurations of accounts, any password between 256 and 1024 characters succeeds. An example of a platform using musl libc without PAM is Alpine Linux.",
  "status": "Analyzed",
  "score_type": "Secondary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 8.1,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://github.com/leonjza/sshhole-lab",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/predkambrij/sshhole-repro",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://hachyderm.io/@damienmiller/117563026759098135",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://marc.info/?l=openssh-unix-dev&m=179388064263131&w=2",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://news.ycombinator.com/item?id=50377976",
      "tags": [
        "Issue Tracking"
      ]
    },
    {
      "url": "https://news.ycombinator.com/item?id=50378228",
      "tags": [
        "Issue Tracking"
      ]
    },
    {
      "url": "https://www.openssh.org/releasenotes.html#10.6p2",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/11/09/27",
      "tags": [
        "Mailing List"
      ]
    },
    {
      "url": "https://alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass/",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://github.com/coollabsio/coolify/discussions/12484",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://github.com/google/goonami-scanner/pull/277",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://github.com/panubo/docker-sshd/issues/93",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://news.ycombinator.com/item?id=50379704",
      "tags": [
        "Issue Tracking"
      ]
    },
    {
      "url": "https://isc.sans.edu/diary.html?storyid=33498",
      "tags": [
        "Not Applicable"
      ]
    },
    {
      "url": "https://sshhole.com/",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://sshole.events.greynoise.io/",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-123158",
      "tags": [
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123158",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}