{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-48859","sourceIdentifier":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","published":"2026-06-10T16:17:12.373","lastModified":"2026-10-26T11:10:00.157","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"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 OTP 29.0.2, corresponding to ssh from 6.0 before 6.0.1."},{"lang":"es","value":"Vulnerabilidad de discrepancia de tiempo observable en Erlang/OTP ssh (módulos ssh_auth, ssh_options) permite la enumeración remota de nombres de usuario no autenticados a través de un canal lateral de tiempo en la autenticación de contraseña.\n\nCuando el demonio SSH está configurado con la opción user_passwords o password, ssh_auth:check_password/3 realiza un cálculo PBKDF2-SHA256 con 600.000 iteraciones (~300ms) para nombres de usuario válidos, pero regresa inmediatamente (~0ms) para nombres de usuario inválidos a través de la ruta ssh_options:get_password_option/2. Esta diferencia de tiempo es detectable en un solo intento de autenticación y permite a un atacante no autenticado distinguir nombres de usuario válidos de inválidos.\n\nLas opciones user_passwords y password están documentadas como destinadas a fines de prueba; la alternativa recomendada es pwdfun, que no se ve afectada por esta vulnerabilidad.\n\nEsta vulnerabilidad está asociada con los archivos de programa lib/ssh/src/ssh_auth.erl y lib/ssh/src/ssh_options.erl.\n\nEste problema afecta a OTP desde OTP 29.0 antes de 29.0.2 correspondiente a ssh desde 6.0 antes de 6.0.1."}],"affected":[{"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","affectedData":[{"vendor":"Erlang","product":"OTP","defaultStatus":"unaffected","packageName":"otp","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"modules":["ssh_auth","ssh_options"],"programFiles":["lib/ssh/src/ssh_auth.erl","lib/ssh/src/ssh_options.erl"],"programRoutines":[{"name":"ssh_auth:check_password/3"},{"name":"ssh_options:get_password_option/2"}],"packageURL":"pkg:software-id/erlang.org/otp","versions":[{"version":"29.0","lessThan":"29.0.2","versionType":"otp","status":"affected"}]},{"vendor":"Erlang","product":"OTP","defaultStatus":"unaffected","packageName":"ssh","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"modules":["ssh_auth","ssh_options"],"programFiles":["src/ssh_auth.erl","src/ssh_options.erl"],"programRoutines":[{"name":"ssh_auth:check_password/3"},{"name":"ssh_options:get_password_option/2"}],"repo":"https://github.com/erlang/otp","packageURL":"pkg:otp/ssh?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp\u0026vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git","versions":[{"version":"6.0","lessThan":"6.0.1","versionType":"otp","status":"affected"}]},{"vendor":"Erlang","product":"OTP","defaultStatus":"unaffected","collectionURL":"https://github.com","packageName":"erlang/otp","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"modules":["ssh_auth","ssh_options"],"programFiles":["lib/ssh/src/ssh_auth.erl","lib/ssh/src/ssh_options.erl"],"programRoutines":[{"name":"ssh_auth:check_password/3"},{"name":"ssh_options:get_password_option/2"}],"repo":"https://github.com/erlang/otp","packageURL":"pkg:github/erlang/otp","versions":[{"version":"032d1bc9491a3975c68faf9bc7776115d6ae3005","lessThan":"c342092ef4b369bb409d5b71ac8fd83bab74aedf","versionType":"git","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","type":"Secondary","cvssData":{"version":"4.0","vectorString":"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/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","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","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":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":1.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-06-10T16:19:16.914933Z","id":"CVE-2026-48859","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","type":"Secondary","description":[{"lang":"en","value":"CWE-208"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*","versionStartIncluding":"29.0","versionEndExcluding":"29.0.2","matchCriteriaId":"F4AB1573-4E81-4338-B65A-B3C94C7249FA"},{"vulnerable":true,"criteria":"cpe:2.3:a:erlang:erlang\\/ssh:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.0.1","matchCriteriaId":"0BF9A1F8-83F5-4BEB-A972-3AF5B15947EF"}]}]}],"references":[{"url":"https://cna.erlef.org/cves/CVE-2026-48859.html","source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","tags":["Mitigation","Third Party Advisory"]},{"url":"https://github.com/erlang/otp/commit/c342092ef4b369bb409d5b71ac8fd83bab74aedf","source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","tags":["Patch"]},{"url":"https://github.com/erlang/otp/security/advisories/GHSA-3w6p-vwhf-wvp4","source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","tags":["Mitigation","Vendor Advisory"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-48859","source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","tags":["Mitigation","Third Party Advisory"]},{"url":"https://www.erlang.org/doc/system/versions.html#order-of-versions","source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","tags":["Product"]}]}}