Bug 2487603 (CVE-2026-48855)

Summary: CVE-2026-48855 erlang: Erlang OTP ssh: Information disclosure via symlink resolution in SFTP
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: eglynn, jjoyce, jpretori, jschluet, lhh, mburns, mgarciac
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Erlang OTP ssh, specifically within the `ssh_sftpd` module. An authenticated SFTP client can exploit this vulnerability by creating a symbolic link (symlink) inside a restricted directory (chroot) that points to the root directory. When the client reads this symlink, the `ssh_sftpd` module incorrectly reveals the absolute filesystem path of the SFTP root directory and any symlink targets, rather than the expected restricted path. This exposure of sensitive information allows for file discovery, but does not grant access to file contents, credentials, or paths outside the root directory.
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Bug Depends On: 2488320, 2488319    
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Description OSIDB Bzimport 2026-06-10 16:01:58 UTC 
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.