CVE-2026-8179: IBM Aspera Transfer RCE Vulnerability

CVE-2026-8179 Overview

CVE-2026-8179 is a stack-based buffer overflow [CWE-121] in the asperahttpd component of IBM Aspera High-Speed Transfer Endpoint and IBM Aspera High-Speed Transfer Server. Affected versions span 3.7.4 through 4.4.7 Fix Pack 1. An authenticated attacker can send crafted input that overflows a stack buffer and executes arbitrary code on the underlying host. Successful exploitation compromises confidentiality, integrity, and availability of the file transfer service. Because Aspera deployments commonly handle high-value media, research, and enterprise data, the flaw provides a direct path to lateral movement and data exfiltration. Refer to the IBM Support Page for vendor guidance.

Critical Impact

An authenticated attacker can achieve arbitrary code execution on Aspera servers and endpoints, exposing transferred data and providing a foothold into adjacent infrastructure.

Affected Products

• IBM Aspera High-Speed Transfer Endpoint 3.7.4 through 4.4.7 Fix Pack 1
• IBM Aspera High-Speed Transfer Server 3.7.4 through 4.4.7 Fix Pack 1
• asperahttpd component shared across the above products

Discovery Timeline

• 2026-05-27 - CVE-2026-8179 published to NVD
• 2026-05-27 - Last updated in NVD database

Technical Details for CVE-2026-8179

Vulnerability Analysis

The flaw resides in asperahttpd, the HTTP fallback and management daemon that ships with IBM Aspera High-Speed Transfer products. The daemon mishandles bounds checking when copying attacker-influenced data into a fixed-size stack buffer. An authenticated session is required to reach the vulnerable code path, which keeps user interaction out of the attack chain. Once reached, the overflow corrupts saved return addresses or adjacent control data and redirects execution.

Because Aspera services typically run with elevated privileges to manage transfers across the filesystem, code executed through this flaw inherits broad access to staged content, configuration files, and credentials. The network-reachable nature of asperahttpd means the attacker does not need local access to trigger the overflow.

Root Cause

The root cause is classic stack-based buffer overflow behavior [CWE-121]. The asperahttpd component accepts data of variable length but copies it into a fixed-length stack allocation without enforcing a length boundary. Compiler or runtime mitigations such as stack canaries or address space layout randomization (ASLR) are insufficient to fully neutralize the issue, allowing reliable control-flow hijack in exploitable configurations.

Attack Vector

The attack is network-based and requires valid credentials for the Aspera service. An attacker with a low-privileged account submits a crafted request to asperahttpd containing an oversized field. The overflow overwrites stack memory, and the attacker uses the corrupted return path to execute injected shellcode or pivot through return-oriented programming gadgets. No user interaction is required, and the scope remains within the vulnerable process boundary.

No public proof-of-concept has been released, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog at the time of publication.

Detection Methods for CVE-2026-8179

Indicators of Compromise

• Unexpected crashes or restarts of the asperahttpd process, particularly with segmentation faults logged in system journals.
• Oversized or malformed HTTP requests to Aspera management endpoints originating from authenticated sessions.
• New child processes spawned by asperahttpd that execute shells, interpreters, or networking utilities.
• Outbound connections from the Aspera host to unfamiliar destinations following authenticated transfer activity.

Detection Strategies

• Monitor process lineage for asperahttpd to flag any execution of /bin/sh, bash, python, or powershell as child processes.
• Inspect HTTP request logs for abnormally long header values or URI components directed at Aspera ports.
• Correlate authentication events with subsequent crashes or memory faults attributed to the Aspera service.

Monitoring Recommendations

• Enable verbose logging on Aspera services and forward logs to a centralized analytics platform for correlation.
• Track file integrity on Aspera binaries, configuration directories, and transfer staging paths.
• Alert on privilege escalation attempts and credential access activity on hosts running Aspera components.

How to Mitigate CVE-2026-8179

Immediate Actions Required

• Apply the fixed release published by IBM as referenced in the IBM Support Page.
• Inventory all Aspera High-Speed Transfer Endpoint and Server installations and confirm versions against the affected range 3.7.4 through 4.4.7 Fix Pack 1.
• Rotate credentials for any account with access to Aspera services, prioritizing service and administrative accounts.
• Restrict network access to asperahttpd to known transfer partners using firewall rules or segmentation.

Patch Information

IBM has published remediation guidance and fixed packages for affected Aspera High-Speed Transfer Endpoint and Server releases. Administrators should consult the IBM Support Page for the specific Fix Pack versions and upgrade instructions that address the asperahttpd buffer overflow.

Workarounds

• Limit Aspera account provisioning to required personnel and enforce strong authentication on all transfer accounts.
• Place Aspera services behind a reverse proxy or VPN that performs request size validation before traffic reaches asperahttpd.
• Disable the HTTP fallback feature where business processes do not require it, reducing exposure of the vulnerable component.

# Configuration example: restrict asperahttpd exposure with host firewall rules
# Allow only known transfer partner subnets to reach Aspera HTTP ports
iptables -A INPUT -p tcp --dport 9091 -s 203.0.113.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 9092 -s 203.0.113.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 9091 -j DROP
iptables -A INPUT -p tcp --dport 9092 -j DROP