{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "29.0"
              },
              {
                "fixed": "29.0.2"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "550d7b7898706c7822362c42e7b93120c1d1f29a"
            },
            {
              "fixed": "36b336d7675edfb976768465c5067bc8bc16ee9a"
            },
            {
              "fixed": "c342092ef4b369bb409d5b71ac8fd83bab74aedf"
            }
          ],
          "repo": "https://github.com/erlang/otp",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-3w6p-vwhf-wvp4"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-208"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48859.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "6.0"
          },
          {
            "fixed": "6.0.1"
          },
          {
            "introduced": "032d1bc9491a3975c68faf9bc7776115d6ae3005"
          },
          {
            "fixed": "c342092ef4b369bb409d5b71ac8fd83bab74aedf"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Observable Timing Discrepancy vulnerability in Erlang/OTP ssh (ssh_auth, ssh_options modules) allows unauthenticated remote username enumeration via timing side-channel in password authentication.\n\nWhen the SSH daemon is configured with the user_passwords or password option, ssh_auth:check_password/3 performs a PBKDF2-SHA256 computation with 600,000 iterations (~300ms) for valid usernames, but returns immediately (~0ms) for invalid usernames via the ssh_options:get_password_option/2 path. This timing difference is detectable in a single authentication attempt and allows an unauthenticated attacker to distinguish valid from invalid usernames.\n\nThe user_passwords and password options are documented as intended for test purposes; the recommended alternative is pwdfun, which is not affected by this vulnerability.\n\nThis vulnerability is associated with program files lib/ssh/src/ssh_auth.erl and lib/ssh/src/ssh_options.erl.\n\nThis issue affects OTP from OTP 29.0 before 29.0.2 corresponding to ssh from 6.0 before 6.0.1.",
  "id": "CVE-2026-48859",
  "modified": "2026-07-08T05:38:28.421474642Z",
  "published": "2026-06-10T14:35:43.553Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-48859.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-48859"
    },
    {
      "type": "WEB",
      "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48859.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/erlang/otp/security/advisories/GHSA-3w6p-vwhf-wvp4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48859"
    },
    {
      "type": "FIX",
      "url": "https://github.com/erlang/otp/commit/c342092ef4b369bb409d5b71ac8fd83bab74aedf"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/erlang/otp"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "SSH server timing side-channel in ssh_auth:check_password/3 allows unauthenticated username enumeration"
}