CVE-2026-48859

{"id": "CVE-2026-48859", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-48859", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-10T16:19:16.914933Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "affectedData": [{"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "vendor": "Erlang", "modules": ["ssh_auth", "ssh_options"], "product": "OTP", "versions": [{"status": "affected", "version": "29.0", "lessThan": "29.0.2", "versionType": "otp"}], "packageURL": "pkg:software-id/erlang.org/otp", "packageName": "otp", "programFiles": ["lib/ssh/src/ssh_auth.erl", "lib/ssh/src/ssh_options.erl"], "defaultStatus": "unaffected", "programRoutines": [{"name": "ssh_auth:check_password/3"}, {"name": "ssh_options:get_password_option/2"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "modules": ["ssh_auth", "ssh_options"], "product": "OTP", "versions": [{"status": "affected", "version": "6.0", "lessThan": "6.0.1", "versionType": "otp"}], "packageURL": "pkg:otp/ssh?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git", "packageName": "ssh", "programFiles": ["src/ssh_auth.erl", "src/ssh_options.erl"], "defaultStatus": "unaffected", "programRoutines": [{"name": "ssh_auth:check_password/3"}, {"name": "ssh_options:get_password_option/2"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "modules": ["ssh_auth", "ssh_options"], "product": "OTP", "versions": [{"status": "affected", "version": "032d1bc9491a3975c68faf9bc7776115d6ae3005", "lessThan": "c342092ef4b369bb409d5b71ac8fd83bab74aedf", "versionType": "git"}], "packageURL": "pkg:github/erlang/otp", "packageName": "erlang/otp", "programFiles": ["lib/ssh/src/ssh_auth.erl", "lib/ssh/src/ssh_options.erl"], "collectionURL": "https://github.com", "defaultStatus": "unaffected", "programRoutines": [{"name": "ssh_auth:check_password/3"}, {"name": "ssh_options:get_password_option/2"}]}]}], "published": "2026-06-10T16:17:12.373", "references": [{"url": "https://cna.erlef.org/cves/CVE-2026-48859.html", "tags": ["Mitigation", "Third Party Advisory"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/erlang/otp/commit/c342092ef4b369bb409d5b71ac8fd83bab74aedf", "tags": ["Patch"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/erlang/otp/security/advisories/GHSA-3w6p-vwhf-wvp4", "tags": ["Mitigation", "Vendor Advisory"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://osv.dev/vulnerability/EEF-CVE-2026-48859", "tags": ["Mitigation", "Third Party Advisory"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://www.erlang.org/doc/system/versions.html#order-of-versions", "tags": ["Product"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "description": [{"lang": "en", "value": "CWE-208"}]}], "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\u00a029.0 before OTP\u00a029.0.2, corresponding to ssh from 6.0 before 6.0.1."}, {"lang": "es", "value": "Vulnerabilidad de discrepancia de tiempo observable en Erlang/OTP ssh (m\u00f3dulos ssh_auth, ssh_options) permite la enumeraci\u00f3n remota de nombres de usuario no autenticados a trav\u00e9s de un canal lateral de tiempo en la autenticaci\u00f3n de contrase\u00f1a.\n\nCuando el demonio SSH est\u00e1 configurado con la opci\u00f3n user_passwords o password, ssh_auth:check_password/3 realiza un c\u00e1lculo PBKDF2-SHA256 con 600.000 iteraciones (~300ms) para nombres de usuario v\u00e1lidos, pero regresa inmediatamente (~0ms) para nombres de usuario inv\u00e1lidos a trav\u00e9s de la ruta ssh_options:get_password_option/2. Esta diferencia de tiempo es detectable en un solo intento de autenticaci\u00f3n y permite a un atacante no autenticado distinguir nombres de usuario v\u00e1lidos de inv\u00e1lidos.\n\nLas opciones user_passwords y password est\u00e1n documentadas como destinadas a fines de prueba; la alternativa recomendada es pwdfun, que no se ve afectada por esta vulnerabilidad.\n\nEsta vulnerabilidad est\u00e1 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."}], "lastModified": "2026-10-26T11:10:00.157", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F4AB1573-4E81-4338-B65A-B3C94C7249FA", "versionEndExcluding": "29.0.2", "versionStartIncluding": "29.0"}, {"criteria": "cpe:2.3:a:erlang:erlang\\/ssh:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0BF9A1F8-83F5-4BEB-A972-3AF5B15947EF", "versionEndExcluding": "6.0.1", "versionStartIncluding": "6.0"}], "operator": "OR"}]}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}