Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-48855

Severity CVSS v4.0:
LOW
Type:
CWE-200 Information Leak / Disclosure
Publication date:
10/06/2026
Last modified:
15/06/2026

Description

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Erlang OTP ssh (ssh_sftpd module) allows File Discovery.<br /> <br /> 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 /.<br /> <br /> 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.<br /> <br /> This vulnerability is associated with program files lib/ssh/src/ssh_sftpd.erl.<br /> <br /> 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.

Impact

Vector 4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVSS v4.0 Severity and Metrics:

Base Score: 2.30 LOW
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): Present
Privileges Required (PR): Low
User Interaction (UI): None
Confidentiality (VC): Low
Integrity (VI): None
Availability (VA): None
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None

Base Score 4.0
2.30
Severity 4.0
LOW
Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N CVSS v3.1 Severity and Metrics:

Base Score: 6.50 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): None
Availability (A): None

Base Score 3.x
6.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* 17.0 (including) 27.3.4.13 (excluding)
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* 28.0 (including) 28.5.0.2 (excluding)
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* 29.0 (including) 29.0.2 (excluding)
cpe:2.3:a:erlang:erlang\/ssh:*:*:*:*:*:*:*:* 3.0.1 (including) 5.2.11.8 (excluding)
cpe:2.3:a:erlang:erlang\/ssh:*:*:*:*:*:*:*:* 5.5 (including) 5.5.2.1 (excluding)
cpe:2.3:a:erlang:erlang\/ssh:*:*:*:*:*:*:*:* 6.0 (including) 6.0.1 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools