CVE-2026-14958: IBM Aspera Faspex 5 RCE Vulnerability

CVE-2026-14958 Overview

CVE-2026-14958 is a command injection vulnerability in IBM Aspera Faspex 5, affecting versions 5.0.0 through 5.0.15.4. The flaw stems from unquoted shell interpolation in the application, which allows a remote authenticated attacker with high privileges to execute arbitrary code on the underlying host. Successful exploitation impacts confidentiality, integrity, and availability, and the scope change indicates the attacker can affect resources beyond the vulnerable component. IBM has published a support advisory addressing the issue.

Critical Impact
An authenticated attacker can execute arbitrary operating system commands on the Faspex 5 server, leading to full compromise of the file transfer platform and any files it processes.

Affected Products

IBM Aspera Faspex 5 version 5.0.0
IBM Aspera Faspex 5 versions 5.0.1 through 5.0.15.3
IBM Aspera Faspex 5 version 5.0.15.4

Discovery Timeline

2026-07-28 - CVE-2026-14958 published to the National Vulnerability Database
2026-07-30 - Last updated in NVD database

Technical Details for CVE-2026-14958

Vulnerability Analysis

The vulnerability is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command, commonly referred to as OS Command Injection. IBM Aspera Faspex 5 constructs shell commands using user-controllable input without properly quoting arguments passed to the shell interpreter. When the shell parses these commands, embedded metacharacters break out of the intended argument context. This allows attacker-supplied strings to be interpreted as additional shell commands rather than opaque data.

The attack requires authentication, meaning the adversary must possess valid credentials with elevated privileges within the Faspex 5 application. Once authenticated, the attacker can supply crafted input to a vulnerable endpoint that ultimately reaches the shell without proper sanitization.

Root Cause

The root cause is unquoted shell interpolation. When application code interpolates variables directly into shell command strings without wrapping them in single quotes or using safe process-execution APIs that bypass the shell, an attacker can inject shell metacharacters such as ;, &&, |, `, or $(). These characters cause the shell to execute attacker-controlled commands with the privileges of the Faspex 5 service account.

Attack Vector

Exploitation occurs over the network against the Faspex 5 web interface or API. The attacker authenticates using valid administrative credentials, then submits a request containing shell metacharacters in a parameter that is later passed to the shell. The injected commands execute in the context of the Faspex 5 process. Because the CVSS scope is marked as changed, the impact can extend beyond the Faspex 5 process boundary to other components on the host, including the file transfer subsystem and stored files. See the IBM Support Page for vendor-specific technical details.

Detection Methods for CVE-2026-14958

Indicators of Compromise

Unexpected child processes spawned by the Faspex 5 service account, particularly shells such as /bin/sh, /bin/bash, or utilities like curl, wget, nc, or python.
Outbound network connections from the Faspex 5 host to unfamiliar external addresses shortly after authenticated API requests.
Faspex application logs containing shell metacharacters (;, |, &&, `, $() in request parameters.

Detection Strategies

Monitor process lineage on Faspex 5 servers and alert when the Faspex service parent process launches an interactive shell or scripting interpreter.
Correlate authenticated Faspex 5 API requests with subsequent process creation events on the same host within a short time window.
Deploy web application logging that captures full request bodies for administrative endpoints so injected payloads can be reviewed after the fact.

Monitoring Recommendations

Enable audit logging for all privileged Faspex 5 accounts and forward logs to a centralized SIEM for retention and correlation.
Baseline normal process activity for the Faspex 5 service and alert on deviations, including unexpected outbound connections or file writes to sensitive directories.
Track failed and successful authentication events against high-privilege Faspex accounts to identify credential-stuffing or brute-force activity that could precede exploitation.

How to Mitigate CVE-2026-14958

Immediate Actions Required

Apply the patch referenced on the IBM Support Page to upgrade Faspex 5 beyond version 5.0.15.4.
Rotate credentials for all high-privilege Faspex 5 accounts and enforce multi-factor authentication where supported.
Review Faspex 5 audit logs for signs of exploitation attempts prior to patching, focusing on requests containing shell metacharacters.

Patch Information

IBM has released a fixed version of Aspera Faspex 5 that resolves the unquoted shell interpolation. Administrators should consult the IBM Support Page for the exact fixed version and upgrade instructions. Apply the vendor-provided update to all Faspex 5 instances running versions 5.0.0 through 5.0.15.4.

Workarounds

Restrict network access to the Faspex 5 administrative interface to trusted management networks only, reducing the attack surface for authenticated exploitation.
Limit the number of accounts with high-privilege roles in Faspex 5 and audit role assignments regularly.
Deploy a web application firewall in front of Faspex 5 with rules that block requests containing shell metacharacters in unexpected parameters.

bash

# Example WAF rule concept to block shell metacharacters in Faspex API parameters
# (adapt to your WAF syntax and test in monitoring mode first)
SecRule ARGS "@rx [;&|`$()]" \
    "id:1014958,phase:2,deny,status:403,\
    msg:'Potential CVE-2026-14958 shell metacharacter injection',\
    tag:'CVE-2026-14958'"