Vulnerability-Lookup

GHSA-4FCC-VM97-GX3X

Vulnerability from github – Published: 2026-11-05 18:33 – Updated: 2026-11-05 21:34

Details

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.

Severity

8.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-123158"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-394"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-11-05T16:17:47Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-4fcc-vm97-gx3x",
  "modified": "2026-11-05T21:34:49Z",
  "published": "2026-11-05T18:33:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123158"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/goonami-scanner/pull/277"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482"
    },
    {
      "type": "WEB",
      "url": "https://alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass"
    },
    {
      "type": "WEB",
      "url": "https://github.com/leonjza/sshhole-lab"
    },
    {
      "type": "WEB",
      "url": "https://github.com/predkambrij/sshhole-repro"
    },
    {
      "type": "WEB",
      "url": "https://hachyderm.io/@damienmiller/117563026759098135"
    },
    {
      "type": "WEB",
      "url": "https://marc.info/?l=openssh-unix-dev\u0026m=179388064263131\u0026w=2"
    },
    {
      "type": "WEB",
      "url": "https://news.ycombinator.com/item?id=50377976"
    },
    {
      "type": "WEB",
      "url": "https://news.ycombinator.com/item?id=50378228"
    },
    {
      "type": "WEB",
      "url": "https://news.ycombinator.com/item?id=50379704"
    },
    {
      "type": "WEB",
      "url": "https://sshhole.com"
    },
    {
      "type": "WEB",
      "url": "https://www.openssh.org/releasenotes.html#10.6p2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-123158 (GCVE-0-2026-123158)

Vulnerability from cvelistv5 – Published: 2026-11-05 15:46 – Updated: 2026-11-06 04:56

Summary

Severity

8.1 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-11-05 00:00 UTC

CWE

CWE-394 - Unexpected Status Code or Return Value

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2230 records in the last 180 days details

References

12 references

URL	Tags
https://www.openssh.org/releasenotes.html#10.6p2
https://github.com/openssh/openssh-portable/commi…
https://news.ycombinator.com/item?id=50377976
https://news.ycombinator.com/item?id=50378228
https://marc.info/?l=openssh-unix-dev&m=179388064…
https://hachyderm.io/@damienmiller/117563026759098135
https://github.com/predkambrij/sshhole-repro
https://github.com/leonjza/sshhole-lab
https://alpinelinux.org/posts/2026-11-05-openssh-…
https://news.ycombinator.com/item?id=50379704
https://github.com/google/goonami-scanner/pull/277
https://sshhole.com	exploit

Impacted products

1 product

Vendor	Product	Version
OpenBSD	OpenSSH	Affected: 0 , < 10.6p2 (custom) cpe:2.3:a:openbsd:openssh::::::::

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-11-05T21:06:39.062Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass/"
          },
          {
            "url": "https://news.ycombinator.com/item?id=50379704"
          },
          {
            "url": "https://github.com/google/goonami-scanner/pull/277"
          }
        ],
        "title": "CVE Program Container",
        "x_generator": {
          "engine": "ADPogram 0.0.1"
        }
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-123158",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-11-05T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-11-06T04:56:35.243Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://sshhole.com"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "Linux"
          ],
          "product": "OpenSSH",
          "vendor": "OpenBSD",
          "versions": [
            {
              "lessThan": "10.6p2",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "10.6p2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-394",
              "description": "CWE-394 Unexpected Status Code or Return Value",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-05T15:46:26.488Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://www.openssh.org/releasenotes.html#10.6p2"
        },
        {
          "url": "https://github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482"
        },
        {
          "url": "https://news.ycombinator.com/item?id=50377976"
        },
        {
          "url": "https://news.ycombinator.com/item?id=50378228"
        },
        {
          "url": "https://marc.info/?l=openssh-unix-dev\u0026m=179388064263131\u0026w=2"
        },
        {
          "url": "https://hachyderm.io/@damienmiller/117563026759098135"
        },
        {
          "url": "https://github.com/predkambrij/sshhole-repro"
        },
        {
          "url": "https://github.com/leonjza/sshhole-lab"
        }
      ],
      "x_generator": {
        "engine": "CVE-Request-form 0.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-123158",
    "datePublished": "2026-11-05T15:46:26.488Z",
    "dateReserved": "2026-11-05T15:46:25.881Z",
    "dateUpdated": "2026-11-06T04:56:35.243Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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