Erlang OTP ssh_sftpd.erl information disclosure

Summaryinfo

A vulnerability classified as problematic was found in Erlang OTP. This affects an unknown function in the library lib/ssh/src/ssh_sftpd.erl. Such manipulation leads to information disclosure. This vulnerability is uniquely identified as CVE-2026-48855. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Erlang OTP (version unknown) and classified as problematic. Affected by this issue is an unknown function in the library lib/ssh/src/ssh_sftpd.erl. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

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 29.0.2, 28.5.0.2 and 27.3.4.13 corresponding to ssh from 3.0.1 before 6.0.1, 5.5.2.1 and 5.2.11.8.

The weakness was disclosed by Jonatan Männchen as GHSA-pv7g-pjrq-x2fh. The advisory is available at github.com. This vulnerability is handled as CVE-2026-48855 since 05/25/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading eliminates this vulnerability. Applying the patch 8f4224a0d2676b0653d2c71a889a956e8c2c62d6 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• Erlang

Name

• OTP

License

• open-source

Website

• Product: https://github.com/erlang/otp/

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