CVE-2026-8175: IBM Aspera Buffer Overflow Vulnerability

CVE-2026-8175 Overview

CVE-2026-8175 is a heap-based buffer overflow [CWE-122] 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. The flaw is reachable over the network without authentication or user interaction. Successful exploitation can crash the service, bypass authentication, or lead to remote code execution on the host running the transfer service.

Critical Impact

Unauthenticated attackers can trigger memory corruption in asperahttpd over the network, enabling denial of service, authentication bypass, or remote code execution against IBM Aspera transfer 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 shipped with the above products

Discovery Timeline

• 2026-05-27 - CVE-2026-8175 published to the National Vulnerability Database
• 2026-05-27 - Last updated in NVD database

Technical Details for CVE-2026-8175

Vulnerability Analysis

The vulnerability resides in asperahttpd, the HTTP daemon component of the IBM Aspera High-Speed Transfer product family. asperahttpd handles HTTP and HTTPS traffic associated with Aspera's FASP-based file transfer workflows. According to the IBM advisory, the daemon contains a buffer overflow condition that an attacker can reach across the network.

The condition is classified as [CWE-122] Heap-Based Buffer Overflow. Memory corruption inside the daemon's request handling can corrupt adjacent heap structures. Depending on layout and allocator state, this corruption can crash the process, alter control flow, or modify authentication state. The advisory lists three outcomes: denial of service, authentication bypass, and remote code execution.

Root Cause

The root cause is improper validation of the length of attacker-controlled input copied into a heap buffer within asperahttpd. When the supplied data exceeds the allocated buffer size, the daemon writes past the buffer boundary into adjacent heap memory. IBM has not published the specific request field or parser routine responsible.

Attack Vector

The attack vector is network-based and requires no privileges or user interaction. Any client able to reach the asperahttpd listener can submit a crafted request that triggers the overflow. Because Aspera endpoints are commonly exposed to wide-area networks to support high-throughput file ingestion from partners and customers, the daemon is frequently reachable from untrusted source addresses.

No public proof-of-concept exploit was available at the time of NVD publication. Refer to the IBM Security Advisory for vendor-supplied technical context.

Detection Methods for CVE-2026-8175

Indicators of Compromise

• Unexpected crashes, restarts, or core dumps from the asperahttpd process
• Anomalous HTTP or HTTPS requests to Aspera listener ports containing oversized headers, URIs, or body fields
• New child processes spawned by asperahttpd or outbound connections initiated by the daemon to unfamiliar hosts

Detection Strategies

• Inventory all IBM Aspera High-Speed Transfer Endpoint and Server installations and compare versions against the affected range 3.7.4 through 4.4.7 Fix Pack 1
• Inspect web application firewall and reverse proxy logs in front of Aspera nodes for malformed HTTP requests targeting asperahttpd endpoints
• Correlate process termination events for asperahttpd with preceding inbound network traffic to identify probing or exploitation attempts

Monitoring Recommendations

• Forward asperahttpd access, error, and crash logs to a centralized log platform with alerting on segmentation faults and abnormal exits
• Monitor for asperahttpd spawning shells, scripting interpreters, or network utilities, which would be uncharacteristic for the daemon
• Track network flows from Aspera hosts and alert on outbound connections that do not match expected transfer partners

How to Mitigate CVE-2026-8175

Immediate Actions Required

• Identify every host running IBM Aspera High-Speed Transfer Endpoint or Server within the affected version range and prioritize internet-exposed nodes
• Apply the fixed release referenced in the IBM Security Advisory as soon as it is available in your change window
• Restrict network reachability to asperahttpd listener ports to known partner IP ranges using firewalls or network access control lists

Patch Information

IBM has published remediation guidance in the IBM Security Advisory. Administrators should consult that advisory for the exact fixed version and upgrade procedure for both High-Speed Transfer Endpoint and High-Speed Transfer Server deployments.

Workarounds

• Place Aspera nodes behind a reverse proxy or web application firewall that enforces strict limits on HTTP header, URI, and body sizes
• Disable or block exposure of asperahttpd HTTP and HTTPS listeners where they are not required for production transfers
• Require VPN or mutual TLS access to Aspera management and transfer interfaces until patching is complete

# Example: restrict asperahttpd ports to a known partner subnet using iptables
iptables -A INPUT -p tcp --dport 443 -s 203.0.113.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
iptables -A INPUT -p tcp --dport 8080 -s 203.0.113.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP