CVE-2026-109468: 
Visual Studio 2022 vulnerability analysis and mitigation

CVE-2026-109468 is a Denial of Service vulnerability caused by allocation of resources without limits or throttling in ASP.NET Core. It allows an unauthenticated, remote attacker to exhaust server resources and disrupt service availability over a network without any user interaction. Affected products include Microsoft Visual Studio 2022 version 17.14 (17.14.0–17.14.42), Microsoft Visual Studio 2026 version 18.10 (18.10.0–18.10.4), and System.Formats.Cbor (10.0.0–10.0.13). The vulnerability was disclosed on October 15, 2026, with patches released the same day. It carries a CVSS v3.1 base score of 7.5 (High) (Microsoft MSRC, GitHub Advisory).

The root cause is classified as CWE-770 (Allocation of Resources Without Limits or Throttling), where ASP.NET Core fails to impose restrictions on the size or number of resources allocated in response to network requests. An unauthenticated attacker can exploit this by sending crafted network requests that trigger unbounded resource allocation — potentially related to CBOR (Concise Binary Object Representation) data parsing via the System.Formats.Cbor library — causing memory or CPU exhaustion on the target server. The attack requires no privileges, no user interaction, and has low complexity, making it straightforward to execute remotely. Associated CAPEC patterns include Excessive Allocation (CAPEC-130), Serialized Data Parameter Blowup (CAPEC-229), and Oversized Serialized Data Payloads (CAPEC-231) (Red Hat Bugzilla, GitHub Advisory).

Successful exploitation results in a Denial of Service condition, with high availability impact and no confidentiality or integrity compromise. Attackers can remotely exhaust server resources (memory, CPU, or connection pools) on affected ASP.NET Core applications, causing service disruption or complete unavailability for legitimate users. The scope is unchanged, meaning the impact is confined to the vulnerable component itself, but this can affect all users and dependent services relying on the targeted web application (Microsoft MSRC, GitHub Advisory).

As of the disclosure date (October 15, 2026), no public proof-of-concept exploit code or in-the-wild exploitation has been reported. The EPSS score is 0.0, and the NVD SSVC assessment indicates exploitation is "none" and the vulnerability is not automatable. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No threat actor attribution has been identified (Microsoft MSRC, Red Hat Bugzilla).

Microsoft released patches on October 15, 2026. Users should upgrade to the following fixed versions: Microsoft Visual Studio 2022 version 17.14.42 or later, Microsoft Visual Studio 2026 version 18.10.4 or later, and System.Formats.Cbor version 10.0.13 or later. Organizations unable to patch immediately should consider rate-limiting or throttling network requests to ASP.NET Core endpoints at the network perimeter (e.g., via WAF or reverse proxy) as a temporary mitigation. Upgrading to patched versions is the recommended long-term solution (Microsoft MSRC, GitHub Advisory).

The vulnerability received standard disclosure coverage across security aggregation platforms including VulDB, CVEFeed, and Radar by Offseq shortly after publication. Social media mentions were observed on Mastodon (infosec.exchange and thehackerwire) on the day of disclosure, consistent with routine Patch Tuesday-style coverage. No notable researcher commentary or significant community debate has been identified beyond standard vulnerability tracking (Microsoft MSRC).