What’s Vulnerable › Vulnerabilities

CVE-2026-81624: Undertow-core: undertow: websocketcontainer defaults for buffers and timeouts are infinite

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-31 · updated 2026-09-10
• Weakness: CWE-770

Description

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.

Affected products

• Red Hat build of Apache Camel for Spring Boot 4: all versions
• Red Hat Fuse 7: all versions
• Red Hat JBoss Enterprise Application Platform 7: all versions
• Red Hat JBoss Enterprise Application Platform 8: all versions
• Red Hat Single Sign-On 7: all versions

References

• https://access.redhat.com/security/cve/CVE-2026-81624
• https://bugzilla.redhat.com/show_bug.cgi?id=2524868

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