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CVE-2026-48858

Full vulnerability record from the local CVENow database.

Description

Server-Side Request Forgery (SSRF) vulnerability in Erlang/OTP ftp (ftp_internal module) allows FTP bounce attacks and SSRF via an unvalidated PASV response IP address. The ftp_internal:handle_ctrl_result/2 PASV handler (mode=passive, ipfamily=inet, ftp_extension=false) extracts the IP address from the server's 227 response and passes it directly to gen_tcp:connect/4 without validating it against the control connection peer address. The adjacent EPSV handlers correctly call peername(CSock) to derive the IP from the control connection, but the PASV handler does not. A malicious or compromised FTP server can redirect the client's data connection to an arbitrary internal host and port. On read operations (ftp:ls/1,2, ftp:nlist/1,2, ftp:recv/2,3), data from the redirected target is returned to the caller. On write operations (ftp:send/2,3, ftp:append/2,3), file content is sent to the redirected target. This enables SSRF against internal hosts, cloud metadata endpoints, and FTP bounce attacks against third-party hosts. The vulnerable path is the default configuration (mode=passive, ipfamily=inet, ftp_extension=false). RFC 2577 section 3 explicitly recommends validating the PASV response IP against the control connection peer. The ftp application is deprecated and scheduled for removal in OTP-30. This vulnerability is associated with program files lib/inets/src/ftp/ftp_internal.erl (inets 5.10.4 through 6.5, OTP 17.4 through 20.3) and lib/ftp/src/ftp_internal.erl (ftp 1.0 and later, OTP 21.0 and later). This issue affects OTP from OTP 17.4 before OTP 29.0.2, OTP 28.5.0.2 and OTP 27.3.4.13, corresponding to inets from 5.10.4 before 7.0 and ftp from 1.0 before 1.2.6, 1.2.4.1 and 1.2.3.1.

Severity
MEDIUM
CVSS score
6.3 (v4.0)
Vulnerability status
Modified
Source identifier
6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Published
2026-06-10 16:17:11.077000
Last modified
2026-10-25 23:10:00.167000
View original CVE JSON 
{
  "id": "CVE-2026-48858",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "published": "2026-06-10T16:17:11.077",
  "lastModified": "2026-10-25T23:10:00.167",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Server-Side Request Forgery (SSRF) vulnerability in Erlang/OTP ftp (ftp_internal module) allows FTP bounce attacks and SSRF via an unvalidated PASV response IP address.\n\nThe ftp_internal:handle_ctrl_result/2 PASV handler (mode=passive, ipfamily=inet, ftp_extension=false) extracts the IP address from the server's 227 response and passes it directly to gen_tcp:connect/4 without validating it against the control connection peer address. The adjacent EPSV handlers correctly call peername(CSock) to derive the IP from the control connection, but the PASV handler does not. A malicious or compromised FTP server can redirect the client's data connection to an arbitrary internal host and port. On read operations (ftp:ls/1,2, ftp:nlist/1,2, ftp:recv/2,3), data from the redirected target is returned to the caller. On write operations (ftp:send/2,3, ftp:append/2,3), file content is sent to the redirected target. This enables SSRF against internal hosts, cloud metadata endpoints, and FTP bounce attacks against third-party hosts.\n\nThe vulnerable path is the default configuration (mode=passive, ipfamily=inet, ftp_extension=false). RFC 2577 section 3 explicitly recommends validating the PASV response IP against the control connection peer.\n\nThe ftp application is deprecated and scheduled for removal in OTP-30.\n\nThis vulnerability is associated with program files lib/inets/src/ftp/ftp_internal.erl (inets 5.10.4 through 6.5, OTP 17.4 through 20.3) and lib/ftp/src/ftp_internal.erl (ftp 1.0 and later, OTP 21.0 and later).\n\nThis issue affects OTP from OTP 17.4 before OTP 29.0.2, OTP 28.5.0.2 and OTP 27.3.4.13, corresponding to inets from 5.10.4 before 7.0 and ftp from 1.0 before 1.2.6, 1.2.4.1 and 1.2.3.1."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de falsificación de petición del lado del servidor (SSRF) en Erlang/OTP ftp (módulo ftp_internal) permite ataques de rebote FTP y SSRF a través de una dirección IP de respuesta PASV no validada.\n\nEl gestor PASV ftp_internal:handle_ctrl_result/2 (mode=passive, ipfamily=inet, ftp_extension=false) extrae la dirección IP de la respuesta 227 del servidor y la pasa directamente a gen_tcp:connect/4 sin validarla contra la dirección del par de la conexión de control. Los gestores EPSV adyacentes llaman correctamente a peername(CSock) para derivar la IP de la conexión de control, pero el gestor PASV no lo hace. Un servidor FTP malicioso o comprometido puede redirigir la conexión de datos del cliente a un host y puerto interno arbitrario. En operaciones de lectura (ftp:ls/1,2, ftp:nlist/1,2, ftp:recv/2,3), los datos del objetivo redirigido se devuelven al llamador. En operaciones de escritura (ftp:send/2,3, ftp:append/2,3), el contenido del archivo se envía al objetivo redirigido. Esto permite SSRF contra hosts internos, puntos finales de metadatos en la nube y ataques de rebote FTP contra hosts de terceros.\n\nLa ruta vulnerable es la configuración predeterminada (mode=passive, ipfamily=inet, ftp_extension=false). La sección 3 de RFC 2577 recomienda explícitamente validar la IP de respuesta PASV contra el par de la conexión de control.\n\nLa aplicación ftp está obsoleta y programada para su eliminación en OTP-30.\n\nEsta vulnerabilidad está asociada con los archivos de programa lib/inets/src/ftp/ftp_internal.erl (inets 5.10.4 a 6.5, OTP 17.4 a 20.3) y lib/ftp/src/ftp_internal.erl (ftp 1.0 y posteriores, OTP 21.0 y posteriores).\n\nEste problema afecta a OTP desde OTP 17.4 antes de 29.0.2, 28.5.0.2 y 27.3.4.13 correspondiente a inets desde 5.10.4 antes de 7.0 y ftp desde 1.0 antes de 1.2.6, 1.2.4.1 y 1.2.3.1."
    }
  ],
  "affected": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "affectedData": [
        {
          "vendor": "Erlang",
          "product": "OTP",
          "defaultStatus": "unknown",
          "packageName": "inets",
          "cpes": [
            "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "ftp_internal"
          ],
          "programFiles": [
            "src/ftp/ftp_internal.erl"
          ],
          "programRoutines": [
            {
              "name": "ftp_internal:handle_ctrl_result/2"
            }
          ],
          "repo": "https://github.com/erlang/otp",
          "packageURL": "pkg:otp/inets?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git",
          "versions": [
            {
              "version": "5.10.4",
              "lessThan": "7.0",
              "versionType": "otp",
              "status": "affected"
            }
          ]
        },
        {
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          "product": "OTP",
          "defaultStatus": "unknown",
          "packageName": "ftp",
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          ],
          "modules": [
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          "programFiles": [
            "src/ftp_internal.erl"
          ],
          "programRoutines": [
            {
              "name": "ftp_internal:handle_ctrl_result/2"
            }
          ],
          "repo": "https://github.com/erlang/otp",
          "packageURL": "pkg:otp/ftp?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git",
          "versions": [
            {
              "version": "1.0",
              "lessThan": "*",
              "versionType": "otp",
              "status": "affected",
              "changes": [
                {
                  "at": "1.2.6",
                  "status": "unaffected"
                },
                {
                  "at": "1.2.4.1",
                  "status": "unaffected"
                },
                {
                  "at": "1.2.3.1",
                  "status": "unaffected"
                }
              ]
            }
          ]
        },
        {
          "vendor": "Erlang",
          "product": "OTP",
          "defaultStatus": "unknown",
          "collectionURL": "https://github.com",
          "packageName": "erlang/otp",
          "cpes": [
            "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "ftp_internal"
          ],
          "programFiles": [
            "lib/inets/src/ftp/ftp_internal.erl",
            "lib/ftp/src/ftp_internal.erl"
          ],
          "programRoutines": [
            {
              "name": "ftp_internal:handle_ctrl_result/2"
            }
          ],
          "repo": "https://github.com/erlang/otp",
          "packageURL": "pkg:github/erlang/otp",
          "versions": [
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              "lessThan": "*",
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              "changes": [
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                  "at": "29.0.2",
                  "status": "unaffected"
                },
                {
                  "at": "28.5.0.2",
                  "status": "unaffected"
                },
                {
                  "at": "27.3.4.13",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "be95772ee1fcfe71045ef070130bea7a910b81e3",
              "lessThan": "*",
              "versionType": "git",
              "status": "affected",
              "changes": [
                {
                  "at": "2691a806231ffd0490a8a9e20500dec0c7e73727",
                  "status": "unaffected"
                },
                {
                  "at": "521bcfa24407ee8cb5614823cf905c37ea3aa605",
                  "status": "unaffected"
                }
              ]
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
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        "type": "Secondary",
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          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/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",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
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          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "LOW",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "LOW",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "cvssMetricV31": [
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        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
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          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
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    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "id": "CVE-2026-48858",
          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "yes"
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            {
              "technicalImpact": "partial"
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          "role": "CISA Coordinator",
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  "weaknesses": [
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      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
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  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
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}