FKIE_CVE-2026-48855

Vulnerability from fkie_nvd - Published: 2026-06-10 16:17 - Updated: 2026-10-25 23:10
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Summary
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Erlang OTP ssh (ssh_sftpd module) allows File Discovery. The SSH_FXP_READLINK handler in ssh_sftpd sends the raw result of file:read_link/2 to the client without calling chroot_filename/2 to strip the backend root prefix. An authenticated SFTP client can create a symlink inside the chroot pointing to /; ssh_sftpd resolves the target to the absolute backend root and stores it on disk. Reading the symlink back via SSH_FXP_READLINK returns that absolute path, for example /data/sftp, instead of the chrooted value /. The information disclosed is the absolute filesystem path of the SFTP root directory and of any symlink targets within it. No file contents, credentials, or access to paths outside the root directory are obtainable through this issue alone. This vulnerability is associated with program files lib/ssh/src/ssh_sftpd.erl. This issue affects OTP from OTP 17.0 before OTP 27.3.4.13, OTP 28.5.0.2, and OTP 29.0.2, corresponding to ssh from 3.0.1 before 5.2.11.8, 5.5.2.1, and 6.0.1. Whether OTP before OTP 17.0, corresponding to ssh before 3.0.1, is affected is unknown.
References
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://cna.erlef.org/cves/CVE-2026-48855.htmlMitigation, Third Party Advisory
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/erlang/otp/commit/08225797f7ef943d0c82a1d9dd6650d94ca2580d
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/erlang/otp/commit/8f4224a0d2676b0653d2c71a889a956e8c2c62d6Patch
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/erlang/otp/security/advisories/GHSA-pv7g-pjrq-x2fhMitigation, Vendor Advisory
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://osv.dev/vulnerability/EEF-CVE-2026-48855Mitigation, Third Party Advisory
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://www.erlang.org/doc/system/versions.html#order-of-versionsProduct
Impacted products
Vendor Product Version
erlang erlang\/otp *
erlang erlang\/otp *
erlang erlang\/otp *
erlang erlang\/ssh *
erlang erlang\/ssh *
erlang erlang\/ssh *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unknown",
          "modules": [
            "ssh_sftpd"
          ],
          "packageName": "otp",
          "packageURL": "pkg:software-id/erlang.org/otp",
          "product": "OTP",
          "programFiles": [
            "lib/ssh/src/ssh_sftpd.erl"
          ],
          "programRoutines": [
            {
              "name": "ssh_sftpd:handle_op/4"
            }
          ],
          "vendor": "Erlang",
          "versions": [
            {
              "changes": [
                {
                  "at": "27.3.4.13",
                  "status": "unaffected"
                },
                {
                  "at": "28.5.0.2",
                  "status": "unaffected"
                },
                {
                  "at": "29.0.2",
                  "status": "unaffected"
                }
              ],
              "lessThan": "*",
              "status": "affected",
              "version": "17.0",
              "versionType": "otp"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unknown",
          "modules": [
            "ssh_sftpd"
          ],
          "packageName": "ssh",
          "packageURL": "pkg:otp/ssh?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp\u0026vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Fotp.git",
          "product": "OTP",
          "programFiles": [
            "src/ssh_sftpd.erl"
          ],
          "programRoutines": [
            {
              "name": "ssh_sftpd:handle_op/4"
            }
          ],
          "repo": "https://github.com/erlang/otp",
          "vendor": "Erlang",
          "versions": [
            {
              "changes": [
                {
                  "at": "5.2.11.8",
                  "status": "unaffected"
                },
                {
                  "at": "5.5.2.1",
                  "status": "unaffected"
                },
                {
                  "at": "6.0.1",
                  "status": "unaffected"
                }
              ],
              "lessThan": "*",
              "status": "affected",
              "version": "3.0.1",
              "versionType": "otp"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unknown",
          "modules": [
            "ssh_sftpd"
          ],
          "packageName": "erlang/otp",
          "packageURL": "pkg:github/erlang/otp",
          "product": "OTP",
          "programFiles": [
            "lib/ssh/src/ssh_sftpd.erl"
          ],
          "programRoutines": [
            {
              "name": "ssh_sftpd:handle_op/4"
            }
          ],
          "repo": "https://github.com/erlang/otp",
          "vendor": "Erlang",
          "versions": [
            {
              "lessThan": "8f4224a0d2676b0653d2c71a889a956e8c2c62d6",
              "status": "affected",
              "version": "08225797f7ef943d0c82a1d9dd6650d94ca2580d",
              "versionType": "git"
            },
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "8f4224a0d2676b0653d2c71a889a956e8c2c62d6",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "BF42A5F2-4C27-43FE-B5FA-17A3422B9649",
              "versionEndExcluding": "27.3.4.13",
              "versionStartIncluding": "17.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "902ED4C3-B9DE-4ABC-9BEA-D23DA4F5D373",
              "versionEndExcluding": "28.5.0.2",
              "versionStartIncluding": "28.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F4AB1573-4E81-4338-B65A-B3C94C7249FA",
              "versionEndExcluding": "29.0.2",
              "versionStartIncluding": "29.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:erlang:erlang\\/ssh:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "83A78B2F-66C5-4840-9F31-3A0143B36705",
              "versionEndExcluding": "5.2.11.8",
              "versionStartIncluding": "3.0.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:erlang:erlang\\/ssh:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "468A97BF-9BB0-4318-A6E9-CF69EFE385B7",
              "versionEndExcluding": "5.5.2.1",
              "versionStartIncluding": "5.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:erlang:erlang\\/ssh:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "0BF9A1F8-83F5-4BEB-A972-3AF5B15947EF",
              "versionEndExcluding": "6.0.1",
              "versionStartIncluding": "6.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Erlang OTP ssh (ssh_sftpd module) allows File Discovery.\n\nThe SSH_FXP_READLINK handler in ssh_sftpd sends the raw result of file:read_link/2 to the client without calling chroot_filename/2 to strip the backend root prefix. An authenticated SFTP client can create a symlink inside the chroot pointing to /; ssh_sftpd resolves the target to the absolute backend root and stores it on disk. Reading the symlink back via SSH_FXP_READLINK returns that absolute path, for example /data/sftp, instead of the chrooted value /.\n\nThe information disclosed is the absolute filesystem path of the SFTP root directory and of any symlink targets within it. No file contents, credentials, or access to paths outside the root directory are obtainable through this issue alone.\n\nThis vulnerability is associated with program files lib/ssh/src/ssh_sftpd.erl.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.13, OTP\u00a028.5.0.2, and OTP\u00a029.0.2, corresponding to ssh from 3.0.1 before 5.2.11.8, 5.5.2.1, and 6.0.1. Whether OTP before OTP\u00a017.0, corresponding to ssh before 3.0.1, is affected is unknown."
    },
    {
      "lang": "es",
      "value": "La vulnerabilidad de Exposici\u00f3n de Informaci\u00f3n Sensible a un Actor No Autorizado en Erlang OTP ssh (m\u00f3dulo ssh_sftpd) permite el Descubrimiento de Archivos.\n\nEl gestor SSH_FXP_READLINK en ssh_sftpd env\u00eda el resultado en bruto de file:read_link/2 al cliente sin llamar a chroot_filename/2 para eliminar el prefijo de la ra\u00edz del backend. Un cliente SFTP autenticado puede crear un enlace simb\u00f3lico dentro del chroot apuntando a /; ssh_sftpd resuelve el objetivo a la ra\u00edz absoluta del backend y lo almacena en disco. Leer el enlace simb\u00f3lico de vuelta a trav\u00e9s de SSH_FXP_READLINK devuelve esa ruta absoluta, por ejemplo /data/sftp, en lugar del valor chrooted /.\n\nLa informaci\u00f3n divulgada es la ruta absoluta del sistema de archivos del directorio ra\u00edz SFTP y de cualquier objetivo de enlace simb\u00f3lico dentro de \u00e9l. No se pueden obtener contenidos de archivos, credenciales o acceso a rutas fuera del directorio ra\u00edz a trav\u00e9s de este problema solamente.\n\nEsta vulnerabilidad est\u00e1 asociada con los archivos de programa lib/ssh/src/ssh_sftpd.erl.\n\nEste problema afecta a OTP desde OTP 17.0 antes de 29.0.2, 28.5.0.2 y 27.3.4.13 correspondiente a ssh desde 3.0.1 antes de 6.0.1, 5.5.2.1 y 5.2.11.8."
    }
  ],
  "id": "CVE-2026-48855",
  "lastModified": "2026-10-25T23:10:00.167",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 2.3,
          "baseSeverity": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-48855",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-10T16:22:16.684743Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-10T16:17:09.680",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Mitigation",
        "Third Party Advisory"
      ],
      "url": "https://cna.erlef.org/cves/CVE-2026-48855.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/erlang/otp/commit/08225797f7ef943d0c82a1d9dd6650d94ca2580d"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
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      "url": "https://github.com/erlang/otp/commit/8f4224a0d2676b0653d2c71a889a956e8c2c62d6"
    },
    {
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      "tags": [
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        "Vendor Advisory"
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      "url": "https://github.com/erlang/otp/security/advisories/GHSA-pv7g-pjrq-x2fh"
    },
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    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Product"
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      "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}



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