CVE-2026-32147

published 2026-04-21

CVE-2026-32147: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Erlang OTP ssh (ssh_sftpd module) allows an authenticated SFTP…

Priority P4 27 medium 4.3 CVSS 3.1

AV N AC L PR L UI N S U C N I L A N

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Erlang OTP ssh (ssh_sftpd module) allows an authenticated SFTP user to modify file attributes outside the configured chroot directory.

The SFTP daemon (ssh_sftpd) stores the raw, user-supplied path in file handles instead of the chroot-resolved path. When SSH_FXP_FSETSTAT is issued on such a handle, file attributes (permissions, ownership, timestamps) are modified on the real filesystem path, bypassing the root directory boundary entirely.

Any authenticated SFTP user on a server configured with the root option can modify file attributes of files outside the intended chroot boundary. The prerequisite is that a target file must exist on the real filesystem at the same relative path. Note that this vulnerability only allows modification of file attributes; file contents cannot be read or altered through this attack vector.

If the SSH daemon runs as root, this enables direct privilege escalation: an attacker can set the setuid bit on any binary, change ownership of sensitive files, or make system configuration world-writable.

This vulnerability is associated with program files lib/ssh/src/ssh_sftpd.erl and program routines ssh_sftpd:do_open/4 and ssh_sftpd:handle_op/4.

This issue affects OTP from OTP 17.0 until OTP 28.4.3, 27.3.4.11, and 26.2.5.20 corresponding to ssh from 3.01 until 5.5.3, 5.2.11.7, and 5.1.4.15.

Affected

9 ranges

Vendor	Product	Version range	Fixed in
erlang	erlang_otp	>= 17.0 < 26.2.5.20	26.2.5.20
erlang	erlang_otp	>= 27.0 < 27.3.4.11	27.3.4.11
erlang	erlang_otp	>= 28.0 < 28.4.3	28.4.3
erlang	erlang_ssh	>= 3.0.1 < 5.1.4.15	5.1.4.15
erlang	erlang_ssh	>= 5.2 < 5.2.11.7	5.2.11.7
erlang	erlang_ssh	>= 5.5 < 5.5.2	5.5.2
erlang	otp	>= 07b8f441ca711f9812fad9e9115bab3c3aa92f79 < *	*
erlang	otp	>= 17.0 < *	*
erlang	otp	>= 3.01 < *	*

CVSS provenance

nvd v3.1 4.3 MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

nvd v4.0 5.3 MEDIUM CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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CWE-22