CVE-2026-92215 in a2ui
Summary
by MITRE • 09/16/2026
A vulnerability has been found in a2ui-project a2ui up to 0.10.7. Affected by this vulnerability is the function httpx.get of the file agent_sdks/python/a2ui_agent/src/a2ui/extensions/file_resolve/file_resolver.py of the component FileResolver. The manipulation leads to server-side request forgery. It is possible to initiate the attack remotely. The identifier of the patch is 2bb8423060308bbdea8ba468dabed4fc256d18ea. To fix this issue, it is recommended to deploy a patch.
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Analysis
by VulDB Data Team • 09/16/2026
The vulnerability identified in the a2ui-project library up to version 0.10.7 represents a critical server-side request forgery flaw within its Python agent SDK. Specifically, the defect resides in the httpx.get function located in the file_resolver.py module of the FileResolver component. This architectural weakness allows an attacker to manipulate input parameters passed to this HTTP client method, thereby enabling the application to make unintended requests to internal or external resources under the control of the malicious actor. The presence of such a flaw in a library designed for agent-side operations underscores the importance of secure coding practices even within components that may appear peripheral to core business logic, as they often possess elevated privileges relative to user-space applications and can serve as an entry point into broader network segments.
From a technical perspective, server-side request forgery occurs when a vulnerable application fetches a remote resource specified by the user without validating or sanitizing the input sufficiently. In this case, the httpx.get function likely accepts URLs or hostnames directly from untrusted sources and forwards them to external servers. Because the vulnerability is exploitable remotely, an attacker does not need prior authentication or local access to trigger the exploit. By crafting specific HTTP requests that include maliciously formatted arguments for file resolution operations, the adversary can force the a2ui server to initiate connections to arbitrary destinations. This capability transforms the vulnerable application into a proxy, allowing the attacker to bypass firewalls and other network security controls that typically restrict direct external access to internal services.
The operational impact of this vulnerability is significant due to its potential for data exfiltration, port scanning, and accessing sensitive backend systems. Attackers can leverage SSRF to probe internal networks, identify running services on localhost or private IP ranges, and potentially extract confidential information from APIs that are not exposed to the public internet. Furthermore, if the a2ui server runs with elevated privileges or has access to cloud metadata endpoints, such as those found in AWS EC2 instances, the attacker could retrieve IAM credentials, compromising the entire infrastructure. The ability to initiate attacks remotely amplifies the risk profile, making this vulnerability a high-priority target for automated scanning tools and opportunistic attackers seeking initial footholds within protected environments.
To mitigate this risk, it is imperative to apply the patch identified by commit hash 2bb8423060308bbdea8ba468dabed4fc256d18ea immediately. This update likely introduces input validation mechanisms that restrict the httpx.get function from resolving hostnames or IP addresses belonging to internal network ranges, localhost, or cloud metadata services. In addition to applying the patch, organizations should implement defense-in-depth strategies such as deploying a web application firewall with SSRF detection rules and configuring strict egress filtering policies at the network perimeter. These measures ensure that even if an attacker successfully exploits this vulnerability, their ability to communicate with unauthorized internal resources is severely limited.
This incident aligns with CWE-918, which classifies Server-Side Request Forgery as a weakness where web applications fetch remote resources without validating user-supplied URLs. It also maps to the MITRE ATT&CK technique T1571, specifically Subversion of Trust in DNS or Direct IP Connection, depending on how the attacker bypasses validation. By addressing this flaw through both software updates and network-level controls, security teams can significantly reduce the attack surface associated with server-side request forgery vulnerabilities in Python-based web applications.