CVE-2026-48855
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk43th percentile - higher than 43% of all known CVEs
Summary
Erlang OTP ssh (ssh_sftpd module) has an information disclosure vulnerability. The SSH_FXP_READLINK handler sends the raw result of file:read_link/2 without stripping the backend root prefix, allowing an authenticated SFTP client to discover the absolute path of the SFTP directory. Affects OTP from 17.0 before 27.3.4.13, 28.5.0.2, and 29.0.2.
Risk Assessment
The organization is at risk of filesystem path disclosure, which could aid an attacker in further attacks. Directory structure information may be used for reconnaissance.
Recommendation
Upgrade Erlang OTP to version 27.3.4.13, 28.5.0.2, or 29.0.2. If not possible, restrict access to the SFTP server.
Other vulnerabilities in Erlang OTP ssh
See all- CVE-2026-68956High
The ssh library in Erlang/OTP contains an Allocation of Resources Without Limits or Throttling vulnerability. An authenticated remote attacker can exhaust node memory by repeatedly opening session channels that are never assigned a handler. This affects OTP from 18.1.2 before 27.3.4.18, 28.5.0.7, and 29.1.1 (corresponding to ssh from 4.1.1 before 5.2.11.13, 5.5.2.6, and 6.0.6).
- CVE-2026-54886Medium
An infinite loop vulnerability in the ssh_sftpd module of Erlang/OTP SSH allows an authenticated SFTP user to permanently block an SFTP channel. By sending extended data (SSH_MSG_CHANNEL_EXTENDED_DATA) with a non-zero type code, the attacker causes the handle_data/4 function to loop indefinitely, preventing further message processing on that channel.
- CVE-2026-53422Medium
A vulnerability in the ssh_sftpd module of the SSH server in OTP (Erlang) allows an authenticated SFTP user to enumerate the existence of files and directories outside the configured root directory. The issue stems from improper path handling in the SSH_FXP_REALPATH handler, which does not canonicalize the path before checking restrictions.
- CVE-2026-48859Medium
Erlang/OTP ssh (ssh_auth, ssh_options modules) has an observable timing discrepancy vulnerability. With user_passwords or password option enabled, password checking for valid usernames takes ~300ms, while for invalid ones ~0ms, allowing unauthenticated remote username enumeration.
- CVE-2026-32147Medium
A Path Traversal vulnerability in the ssh_sftpd module of Erlang OTP ssh allows an authenticated SFTP user to modify file attributes outside the configured chroot directory.
Original NVD description (English source)
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Erlang OTP ssh (ssh_sftpd module) allows File Discovery. The SSH_FXP_READLINK handler in ssh_sftpd sends the raw result of file:read_link/2 to the client without calling chroot_filename/2 to strip the backend root prefix. An authenticated SFTP client can create a symlink inside the chroot pointing to /; ssh_sftpd resolves the target to the absolute backend root and stores it on disk. Reading the symlink back via SSH_FXP_READLINK returns that absolute path, for example /data/sftp, instead of the chrooted value /. The information disclosed is the absolute filesystem path of the SFTP root directory and of any symlink targets within it. No file contents, credentials, or access to paths outside the root directory are obtainable through this issue alone. This vulnerability is associated with program files lib/ssh/src/ssh_sftpd.erl. This issue affects OTP from OTP 17.0 before OTP 27.3.4.13, OTP 28.5.0.2, and OTP 29.0.2, corresponding to ssh from 3.0.1 before 5.2.11.8, 5.5.2.1, and 6.0.1. Whether OTP before OTP 17.0, corresponding to ssh before 3.0.1, is affected is unknown.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS