Quick answers
- Is This vulnerability exploited in the wild?
- No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
- How severe is This vulnerability?
- High severity, with a CVSS score of 8.2, published 19 June 2026.
- Which products and versions are affected?
- riganti DotVVM < 4.2.11, > 4.3.0-preview01-final, < 4.3.15, >= 5.0.0-preview01-final, < 5.0.0-preview09-final.
- Is there a fix for This vulnerability?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is This vulnerability attacked?
- It is attacked over the network, in a software library.
- Am I affected?
- Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A Regular Expression Denial of Service (ReDoS) vulnerability exists in the DotVVM routing engine (CWE-1333). The flaw is triggered when a route is defined with multiple unconstrained parameters in a single segment (e.g., "{a}-{b}-{c}") without being separated by a slash. An attacker can provide a long string of characters (such as 32,000 dashes) that causes the backtracking regex engine to consume excessive CPU cycles while attempting to match the route. Patches introduce a 1-second timeout for regex operations; upon timeout, the system attempts to switch to a non-backtracking engine or returns an HTTP 503 error. Fixes are available in versions 4.2.11, 4.3.15, and 5.0.0-preview09.
Affected products
- riganti DotVVM < 4.2.11, > 4.3.0-preview01-final, < 4.3.15, >= 5.0.0-preview01-final, < 5.0.0-preview09-final
Timeline
- 2026-06-18: disclosed
- 2026-06-19: advisory