CVE-2026-118275 in a2ui
Summary
by MITRE • 10/28/2026
A vulnerability was found in a2ui-project a2ui up to 0.10.6. This affects the function DataContext.resolveSignal of the file renderers/web_core/src/v0_9/rendering/data-context.ts of the component Resolver. The manipulation results in resource consumption. The attack can be launched remotely. The exploit has been made public and could be used. The patch is identified as c76e17272e52c12c6dcf68905b1df978c39e9aa5. It is advisable to implement a patch to correct this issue.
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Analysis
by VulDB Data Team • 10/28/2026
The vulnerability identified in the a2ui-project, specifically within versions up to 0.10.6, centers on a critical flaw located in the DataContext.resolveSignal function found in the file renderers/web_core/src/v0_9/rendering/data-context.ts of the Resolver component. This issue represents a significant security risk because it allows for remote exploitation that leads directly to resource consumption issues. The presence of this vulnerability indicates a failure in proper input validation or loop control mechanisms within the signal resolution logic, which is fundamental to how the application processes dynamic data updates from client requests.
From a technical perspective, the flaw likely stems from an inability to properly limit recursive calls or process unbounded inputs when resolving signals. When an attacker manipulates specific parameters sent to this function, they can trigger excessive computational cycles or memory allocation without appropriate safeguards. This behavior aligns with common patterns seen in inefficient resource management vulnerabilities where the system fails to enforce limits on processing depth or input size, leading to a state of exhaustion rather than immediate code execution. The exploit being publicly available suggests that proof-of-concept code exists which demonstrates how this logic can be abused to degrade service availability effectively.
The operational impact of this vulnerability is primarily related to denial of service conditions caused by resource exhaustion. By sending crafted requests that trigger the flawed resolution path, an attacker can consume excessive CPU cycles or memory on the server side. This not only degrades performance for legitimate users but can also lead to complete system unavailability if the resources are fully depleted. Such attacks do not necessarily require authentication and can be launched remotely over standard network protocols, making them particularly dangerous in internet-facing deployments of a2ui applications that rely heavily on dynamic signal processing for rendering content.
In terms of industry classification standards, this vulnerability is best categorized under CWE-400: Uncontrolled Resource Consumption. This category encompasses scenarios where an application does not properly control the allocation and maintenance of limited resources, leading to resource exhaustion. Furthermore, from a tactical standpoint relevant to threat intelligence frameworks like MITRE ATT&CK, this behavior corresponds to techniques associated with Impact or Reconnaissance phases depending on whether the goal is immediate disruption or probing for further weaknesses. The remote nature of the attack places it within contexts where network-based exploitation vectors are prioritized by adversaries seeking low-effort high-impact disruptions against web applications.
To mitigate this risk, organizations must immediately apply the patch identified as commit c76e17272e52c12c6dcf68905b1df978c39e9aa5 to all affected instances of a2ui up to version 0.10.6. This update addresses the underlying logic errors in the DataContext.resolveSignal function that allow for unbounded resource usage. Beyond patching, it is advisable to implement network-level controls such as rate limiting and request size restrictions on endpoints exposing this functionality. Additionally, deploying web application firewalls with rules tuned to detect abnormal patterns of signal resolution requests can provide an additional layer of defense against exploitation attempts while the infrastructure migration or update process is completed.