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.
{
"cna_assigner": "GitHub_M",
"cwe_ids": [
"CWE-1333"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57577.json",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"fixed": "4.2.11"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
}
]
}
]
}{
"extracted_events": [
{
"range": [
{
"introduced": "4.3.0"
},
{
"fixed": "4.3.15"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"introduced": "5.0.0-preview01"
},
{
"fixed": "5.0.0-preview09-final"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "1635245b5eaf9ccf8e3536b9d8b1941819526585"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "4fc26a8591c76fb92ed701352c2a84120cf926c5"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "5728ab80fff9af883b44d11c118d2e8a8991dcd4"
}
],
"source": "REFERENCES_COMMIT"
},
{
"original_tag": "v4.3.15",
"range": [
{
"fixed": "9f770c7621e641f5d000b7a777295bf68a77dd13"
}
],
"source": "REFERENCES_TAG"
},
{
"original_tag": "v5.0.0-preview09",
"range": [
{
"fixed": "6324d80d588f1578aeefa5bcc2ef6e753c826968"
}
],
"source": "REFERENCES_TAG"
}
]
}