Quick answers
- Is CVE-2026-81624 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-81624 being exploited in the wild.
- How severe is CVE-2026-81624?
- High severity, with a CVSS score of 7.5, published 31 August 2026.
- Which products and versions are affected?
- Red Hat WildFly <UNKNOWN>.
- Is there a fix for CVE-2026-81624?
- 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 CVE-2026-81624 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-81624?
- Check whether you run Red Hat WildFly at an affected version. 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
The vulnerability exists in Undertow's WebSocket connection handler, which fails to enforce configuration limits on message buffer sizes and session timeouts—these limits default to unlimited. An unauthenticated remote attacker can exploit this by opening WebSocket connections and sending large amounts of data or maintaining idle connections indefinitely, consuming memory and other server resources until the server runs out of resources and crashes (denial of service). The attack is network-accessible and requires no authentication or user interaction. Patches are available from Red Hat for affected versions of JBoss EAP and WildFly.
Affected products
- JBoss Enterprise Application Platform <UNKNOWN>
- Red Hat WildFly <UNKNOWN>
- Red Hat Undertow <UNKNOWN>
Timeline
- 2026-08-31: disclosed: Published on NVD