What’s Vulnerable › Vulnerabilities

CVE-2026-57577: DotVVM: ReDOS in routing

• Severity: high (CVSS 8.2 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-30
• Weakness: CWE-1333

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: before 4.2.11; from 4.3.0, < 4.3.15; from 5.0.0-preview01, < 5.0.0-preview09-final

References

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

Get alerted when CVE-2026-57577 or the next vulnerability affects your stack