DotVVM: ReDOS in routing
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-1333.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| riganti | dotvvm | before 4.2.11; 4.3.0 to before 4.3.15; 5.0.0-preview01 to before 5.0.0-preview09-final | 4.2.11, 4.3.15, 5.0.0-preview09-final | Patch available | CNA |
- dotvvm Vendorriganti Affected before 4.2.11; 4.3.0 to before 4.3.15; 5.0.0-preview01 to before 5.0.0-preview09-final Fixed in 4.2.11, 4.3.15, 5.0.0-preview09-final Patch available CNA
Remediation
- Fix · CNA dotvvm (riganti) Fixed in 4.2.11, 4.3.15, 5.0.0-preview09-final
Timeline
- 2026-10-02 Threatist record created from CVE-2026-57577
References
Other 6
- https://github.com/riganti/dotvvm/security/advisories/GHSA-c2g3-c4gc-w5wg
- 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
More riganti vulnerabilities
- TI-2026-41429 DotVVM: Missing authorization in AuthorizeActionFilter CVSS 4.0CRITICAL 9.2
- TI-2026-41432 DotVVM: Unrestricted file upload CVSS 3.1MEDIUM 5.3
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences