CVE catalog
CVE-2026-81624
DEBIAN-CVE-2026-81624
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.58% · Oct 25, 2026
Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a remote attacker to send large amounts of data or maintain connections indefinitely, potentially crashing the server by exhausting its memory or other resources.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | undertow | 14 | 1.3.11-1 | vulnerable |
| Debian | undertow | 14 | 1.3.16-1 | vulnerable |
| Debian | undertow | 14 | 1.3.19-1 | vulnerable |
| Debian | undertow | 14 | 1.3.21-1 | vulnerable |
| Debian | undertow | 14 | 1.3.23-1 | vulnerable |
| Debian | undertow | 14 | 1.3.4-1 | vulnerable |
| Debian | undertow | 14 | 1.3.5-1 | vulnerable |
| Debian | undertow | 14 | 1.3.7-1 | vulnerable |
| Debian | undertow | 14 | 1.4.0-1 | vulnerable |
| Debian | undertow | 14 | 1.4.1-1 | vulnerable |
| Debian | undertow | 14 | 1.4.18-1 | vulnerable |
| Debian | undertow | 14 | 1.4.20-1 | vulnerable |
| Debian | undertow | 14 | 1.4.21-1 | vulnerable |
| Debian | undertow | 14 | 1.4.21-2 | vulnerable |
| Debian | undertow | 14 | 1.4.22-1 | vulnerable |
| Debian | undertow | 14 | 1.4.23-1 | vulnerable |
| Debian | undertow | 14 | 1.4.23-2 | vulnerable |
| Debian | undertow | 14 | 1.4.23-3 | vulnerable |
| Debian | undertow | 14 | 1.4.25-1 | vulnerable |
| Debian | undertow | 14 | 1.4.25-2 | vulnerable |
| Debian | undertow | 14 | 1.4.3-1 | vulnerable |
| Debian | undertow | 14 | 1.4.4-1 | vulnerable |
| Debian | undertow | 14 | 1.4.6-1 | vulnerable |
| Debian | undertow | 14 | 1.4.7-1 | vulnerable |
| Debian | undertow | 14 | 1.4.8-1 | vulnerable |
| Debian | undertow | 14 | 2.0.23-1 | vulnerable |
| Debian | undertow | 14 | 2.0.25-1 | vulnerable |
| Debian | undertow | 14 | 2.0.26-1 | vulnerable |
| Debian | undertow | 14 | 2.0.27-1 | vulnerable |
| Debian | undertow | 14 | 2.0.28-1 | vulnerable |
| Debian | undertow | 14 | 2.0.29-1 | vulnerable |
| Debian | undertow | 14 | 2.0.30-1 | vulnerable |
| Debian | undertow | 14 | 2.1.0-1 | vulnerable |
| Debian | undertow | 14 | 2.1.1-1 | vulnerable |
| Debian | undertow | 14 | 2.1.3-1 | vulnerable |
| Debian | undertow | 14 | 2.2.0-1 | vulnerable |
| Debian | undertow | 14 | 2.2.10-1 | vulnerable |
| Debian | undertow | 14 | 2.2.12-1 | vulnerable |
| Debian | undertow | 14 | 2.2.13-1 | vulnerable |
| Debian | undertow | 14 | 2.2.14-1 | vulnerable |
| Debian | undertow | 14 | 2.2.16-1 | vulnerable |
| Debian | undertow | 14 | 2.2.17-1 | vulnerable |
| Debian | undertow | 14 | 2.2.18-1 | vulnerable |
| Debian | undertow | 14 | 2.2.19-1 | vulnerable |
| Debian | undertow | 14 | 2.2.2-1 | vulnerable |
| Debian | undertow | 14 | 2.2.20-1 | vulnerable |
| Debian | undertow | 14 | 2.2.21-1 | vulnerable |
| Debian | undertow | 14 | 2.2.3-1 | vulnerable |
| Debian | undertow | 14 | 2.2.4-1 | vulnerable |
| Debian | undertow | 14 | 2.2.5-1 | vulnerable |
| Debian | undertow | 14 | 2.2.8-1 | vulnerable |
| Debian | undertow | 14 | 2.3.18-1 | vulnerable |
| Debian | undertow | 14 | 2.3.18-2 | vulnerable |
| Debian | undertow | 14 | 2.3.20-1 | vulnerable |
| Debian | undertow | 14 | 2.3.8-1 | vulnerable |
| Debian | undertow | 14 | 2.3.8-2 | vulnerable |
Fixed-version evidence
OpenFactory catalog packages
No matching packages in this catalog.
Observed: