CVE-2026-57577 DotVVM: ReDOS in routing
Remote attackers can cause excessive CPU consumption and service unavailability by sending crafted URLs to DotVVM applications with unconstrained route parameters.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-57577?
CVE-2026-57577 is a high-severity denial of service vulnerability in riganti dotvvm, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-1333
Which versions are affected by CVE-2026-57577?
How do I fix CVE-2026-57577?
No fix has been published for CVE-2026-57577 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-57577 being exploited?
There is no known exploitation of CVE-2026-57577 in the wild and no public exploit code.
Sources
Also known as GHSA-c2g3-c4gc-w5wg.