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Otp CVE-2026-32147

| EUVDEUVD-2026-24085 MEDIUM
Path Traversal (CWE-22)
2026-04-21 EEF
Privilege Escalation Path Traversal Otp
5.3
CVSS 4.0 · NVD
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Severity by source

NVD PRIMARY
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
SUSE
4.3 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Primary rating from NVD.

CVSS VectorNVD

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

6
Analysis Generated
Apr 21, 2026 - 12:32 vuln.today
CVSS changed
Apr 21, 2026 - 12:22 NVD
5.3 (MEDIUM)
EUVD ID Assigned
Apr 21, 2026 - 12:15 euvd
EUVD-2026-24085
Analysis Generated
Apr 21, 2026 - 12:15 vuln.today
Patch released
Apr 21, 2026 - 12:15 nvd
Patch available
CVE Published
Apr 21, 2026 - 12:01 nvd
MEDIUM 5.3

DescriptionCVE.org

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.

AnalysisAI

Erlang OTP SSH daemon (ssh_sftpd) stores unresolved user-supplied paths in file handles, allowing authenticated SFTP users to modify file attributes (permissions, ownership, timestamps) outside the configured chroot directory via SSH_FXP_FSETSTAT requests. When the SSH daemon runs as root, this enables privilege escalation through setting setuid bits or changing ownership of system files. The vulnerability affects OTP versions 17.0 through 28.4.3 (and earlier point releases in 27.x and 26.x series); patched versions are available per vendor advisory.

Technical ContextAI

The Erlang OTP ssh_sftpd module implements an SFTP server (RFC 4253/4254) that supports root directory confinement via the root option for privilege separation. The vulnerability exists in the path handling logic of ssh_sftpd:do_open/4 and ssh_sftpd:handle_op/4 routines (lib/ssh/src/ssh_sftpd.erl). When an SFTP file open request (SSH_FXP_OPEN) is processed, the server creates a file handle but stores the raw user-supplied path string rather than the chroot-resolved absolute path. When subsequent SSH_FXP_FSETSTAT operations are issued against that handle, the module performs stat operations on the stored raw path, which is then resolved outside the chroot jail context. This is a classic path traversal (CWE-22) issue: the chroot boundary is enforced at initial path validation but the stored handle contains the original path, allowing the boundary check to be circumvented on subsequent operations.

RemediationAI

Upgrade Erlang OTP to patched versions: OTP 28.4.3 or later (ssh 5.5.3+), OTP 27.3.4.11 or later (ssh 5.2.11.7+), or OTP 26.2.5.20 or later (ssh 5.1.4.15+). The upstream fix is committed to the OTP repository at https://github.com/erlang/otp/commit/28c5d5a6c5f873dc701b597276271763e7d1c004 and resolves the path-storage issue in the ssh_sftpd module. As a compensating control pending patching, restrict SFTP access to the SSH daemon by using firewall rules or SSH configuration to limit which users have SFTP privileges, and audit file attribute changes on the real filesystem outside chroot boundaries using OS-level file integrity monitoring (e.g., auditd on Linux). Run the SSH daemon with the lowest necessary privilege (not as root if possible), using a dedicated service account; this limits the escalation impact but does not prevent the path traversal itself. Note that disabling the root option in ssh_sftpd configuration would prevent this attack but may break intended chroot functionality, so this is not recommended as a primary workaround. Detailed remediation guidance is available in the EEF security advisory at https://github.com/erlang/otp/security/advisories/GHSA-28jg-mw9x-hpm5.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed

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CVE-2026-32147 vulnerability details – vuln.today
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