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    CVE-2026-81624

    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.

    Published:Aug 27, 2026
    Last Modified:Sep 1, 2026
    EPS:Aug 31, 2026
    EPSS Score:0.00332
    CVSS Score:7.5

    Affected Products

    Vendor
    Redhat
    Product
    Build Of Apache Camel For Spring Boot
    Vendor
    Redhat
    Product
    Camel Spring Boot
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Jboss Enterprise Application Platform
    Vendor
    Redhat
    Product
    Jboss Enterprise Application Platform Expansion Pack
    Vendor
    Redhat
    Product
    Jboss Fuse
    Vendor
    Redhat
    Product
    Jbosseapxp
    Vendor
    Redhat
    Product
    Quay 3
    Vendor
    Redhat
    Product
    Red Hat Single Sign On

    Exploits

    No exploit reference

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    CVE-2026-5680 (CVSS 7.5) — A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending specially crafted …
    CVE-2026-19879 (CVSS 5.3) — A flaw was found in Undertow, an HTTP server, within its HTTP response header writing path. The `writeString()…
    CVE-2026-14180 (CVSS 5.3) — A flaw was found in the ChunkReader component of the Undertow HTTP server, which is used by WildFly and JBoss …
    CVE-2026-15565 (CVSS 7.5) — A flaw was found in Undertow. A remote attacker can cause Out of Memory on websockets endpoint without authent…
    CVE-2026-6857 (CVSS 7.5) — A flaw was found in camel-infinispan. This vulnerability involves unsafe deserialization in the ProtoStream re…
    CVE-2026-28369 (CVSS 8.7) — A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with o…
    CVE-2026-28367 (CVSS 8.7) — A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\r\r\r` as a header…
    CVE-2026-28368 (CVSS 8.7) — A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially crafted reque…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High