Vulnerability Description
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 29.0.2, OTP 28.5.0.2 and OTP 27.3.4.13, corresponding to ssh from 3.0.1 before 6.0.1, 5.5.2.1 and 5.2.11.8.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Erlang | Erlang\/Otp | >= 17.0, < 27.3.4.13 |
| Erlang | Erlang\/Ssh | >= 3.0.1, < 5.2.11.8 |
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-48855.htmlMitigationThird Party Advisory
- https://github.com/erlang/otp/commit/8f4224a0d2676b0653d2c71a889a956e8c2c62d6Patch
- https://github.com/erlang/otp/security/advisories/GHSA-pv7g-pjrq-x2fhMitigationVendor Advisory
- https://osv.dev/vulnerability/EEF-CVE-2026-48855MitigationThird Party Advisory
- https://www.erlang.org/doc/system/versions.html#order-of-versionsProduct
FAQ
What is CVE-2026-48855?
CVE-2026-48855 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 ...
How severe is CVE-2026-48855?
CVE-2026-48855 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48855?
Check the references section above for vendor advisories and patch information. Affected products include: Erlang Erlang\/Otp, Erlang Erlang\/Ssh.