# CVE-2026-57577

## Summary

- **CVE ID:** CVE-2026-57577
- **Severity:** HIGH
- **CVSS Score:** 8.2 (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-1333
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 14, 2026

## Description

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.

## Affected Products

- riganti — dotvvm (< 4.2.11)
- riganti — dotvvm (>= 4.3.0, < 4.3.15)
- riganti — dotvvm (>= 5.0.0-preview01, < 5.0.0-preview09-final)

## References

- [CNA](https://github.com/riganti/dotvvm/security/advisories/GHSA-c2g3-c4gc-w5wg)
- [CNA](https://github.com/riganti/dotvvm/commit/1635245b5eaf9ccf8e3536b9d8b1941819526585)
- [CNA](https://github.com/riganti/dotvvm/commit/4fc26a8591c76fb92ed701352c2a84120cf926c5)
- [CNA](https://github.com/riganti/dotvvm/commit/5728ab80fff9af883b44d11c118d2e8a8991dcd4)
- [CNA](https://github.com/riganti/dotvvm/releases/tag/v4.3.15)
- [CNA](https://github.com/riganti/dotvvm/releases/tag/v5.0.0-preview09)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.43%
- **EPSS Percentile:** 36.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._