{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53422", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-06-09T11:01:47.529Z", "datePublished": "2026-07-02T16:06:03.802Z", "dateUpdated": "2026-07-02T17:29:32.878Z"}, "containers": {"cna": {"affected": [{"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["ssh_sftpd"], "packageName": "ssh", "packageURL": "pkg:otp/ssh?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%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": "6.0.2", "status": "unaffected"}, {"at": "5.5.2.2", "status": "unaffected"}, {"at": "5.2.11.9", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "3.0.1", "versionType": "otp"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "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": [{"changes": [{"at": "29.0.3", "status": "unaffected"}, {"at": "28.5.0.3", "status": "unaffected"}, {"at": "27.3.4.14", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "17.0", "versionType": "otp"}, {"changes": [{"at": "059e5785ef8c1d423820ca633fb7b37f47645172", "status": "unaffected"}, {"at": "86622cfaacf57a02c7645d1999f946846b504c94", "status": "unaffected"}, {"at": "c5a8f50ae68888ff243c5c741a06d2b3a4b48b7a", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "84adefa331c4159d432d22840663c38f155cd4c1", "versionType": "git"}]}], "configurations": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>The SFTP subsystem must be configured with the <tt>root</tt> option in <tt>ssh_sftpd:subsystem_spec/1</tt>, and the operator must rely on it to provide filesystem path isolation. 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This allows <tt>..</tt> components in the requested path to bypass the <tt>is_within_root/2</tt> check without being resolved. The un-canonicalized path then enters <tt>resolve_symlinks/2</tt>, which walks up the directory tree above the configured root and issues <tt>read_link()</tt> syscalls on arbitrary filesystem paths.</p><p>An authenticated SFTP client can exploit this by sending a <tt>REALPATH</tt> request with a crafted traversal path. The server response differs depending on whether the target path exists on the host filesystem (<tt>SSH_FXP_NAME</tt> when the path resolves successfully, <tt>SSH_FX_NO_SUCH_FILE</tt> when it does not). This creates a path-existence oracle that an attacker can use to enumerate the filesystem structure outside the configured root, including the existence of sensitive files, directories, and mount points.</p><p>The vulnerability leaks only the existence of paths. 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The information gained may assist further attacks when combined with other vulnerabilities.\n\nThis vulnerability is associated with program files lib/ssh/src/ssh_sftpd.erl and program routine ssh_sftpd:handle_op/4.\n\nThis issue affects OTP from OTP 17.0 until OTP 29.0.3, 28.5.0.3, and 27.3.4.14 corresponding to ssh from 3.0.1 until 6.0.2, 5.5.2.2, and 5.2.11.9.", "supportingMedia": [{"type": "text/html", "value": "<p>Observable Response Discrepancy vulnerability in Erlang OTP <tt>ssh</tt> (<tt>ssh_sftpd</tt> module) allows an authenticated SFTP user to enumerate the existence of files and directories outside the configured root directory.</p><p>The <tt>SSH_FXP_REALPATH</tt> handler in <tt>ssh_sftpd</tt> calls <tt>relate_file_name/3</tt> with <tt>Canonicalize=false</tt>, unlike every other SFTP operation handler. This allows <tt>..</tt> components in the requested path to bypass the <tt>is_within_root/2</tt> check without being resolved. 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