Vulnerability in Riganti Dotvvm

CVE-2026-57577

DotVVM is an open source MVVM framework for web applications. Prior to 4.2.11, 4.3.15, and 5.0.0-preview09-final, a route containing multiple unconstrained parameters in one path segment can cause excessive regular-expression backtracking in DotvvmRoute.IsMatch when a remote requester supplies a long near-match path. DotvvmRouteParser.RouteRegex previously had no matching timeout. Patched runtimes retry with the .NET non-backtracking engine, while runtimes that do not support non-backtracking matching return HTTP 503 after the one-second timeout in DotvvmRoutingMiddleware. This issue is fixed in versions 4.2.11, 4.3.15, and 5.0.0-preview09-final.

Vulnerability class: ReDoS (Regular Expression Denial of Service)

Affected products

  • Riganti Dotvvm — versions < 4.2.11, >= 4.3.0, < 4.3.15, >= 5.0.0-preview01, < 5.0.0-preview09-final

Weakness classification (CWE)

References