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CVE Record

CVE-2026-15565: Undertow: undertow-websockets: undertow: pre-auth dos on websocket endpoint with @serverendpoint class with any @onmessage method

A flaw was found in Undertow. A remote attacker can cause Out of Memory on websockets endpoint without authentication on any @ServerEndpoint class that has any @OnMessage method. This allows an attacker to cause Denial of Service attack without authentication and using only a standard WebSocket handshake.

HighCVSS 7.5Not KEV-listedUpdated
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Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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cwe · low confidence lookup

CWE-120: Exact CWE lookup

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CVE-2026-15565 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
5Timeline events
1ADP providers
11Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6redhat

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2026-15565Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. Source timelineredhat

    Reported to Red Hat.

  2. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  3. Source timelineredhat

    Made public.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatRed Hat JBoss Enterprise Application Platform 7.4.25io.undertow/undertow-websockets-jsr, 2.2.40.SP3-redhat-00001affected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-activemq-artemis, 0:2.16.0-22.redhat_00057.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-glassfish-jsf, 0:2.3.14-11.SP11_redhat_00001.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-ironjacamar, 0:1.5.26-2.Final_redhat_00001.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-jackson-annotations, 0:2.18.8-1.redhat_00003.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-jackson-core, 0:2.18.8-1.redhat_00003.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-jackson-databind, 0:2.18.8-1.redhat_00003.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-jackson-jaxrs-providers, 0:2.18.8-1.redhat_00003.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-jackson-modules-base, 0:2.18.8-1.redhat_00003.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-jackson-modules-java8, 0:2.18.8-1.redhat_00003.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-jboss-remoting, 0:5.0.31-3.SP2_redhat_00001.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-jboss-server-migration, 0:1.10.0-46.Final_redhat_00044.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-netty, 0:4.1.135-1.Final_redhat_00001.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-netty-transport-native-epoll, 0:4.1.135-1.Final_redhat_00001.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-picketlink-bindings, 0:2.5.5-30.SP12_redhat_00020.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-picketlink-federation, 0:2.5.5-24.SP12_redhat_00016.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-undertow, 0:2.2.40-2.SP3_redhat_00001.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7eap7-wildfly, 0:7.4.25-2.GA_redhat_00001.1.el7eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8eap7-activemq-artemis, 0:2.16.0-22.redhat_00057.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8eap7-glassfish-jsf, 0:2.3.14-11.SP11_redhat_00001.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8eap7-ironjacamar, 0:1.5.26-2.Final_redhat_00001.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8eap7-jackson-annotations, 0:2.18.8-1.redhat_00003.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8eap7-jackson-core, 0:2.18.8-1.redhat_00003.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8eap7-jackson-databind, 0:2.18.8-1.redhat_00003.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8eap7-jackson-jaxrs-providers, 0:2.18.8-1.redhat_00003.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8eap7-jackson-modules-base, 0:2.18.8-1.redhat_00003.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8eap7-jackson-modules-java8, 0:2.18.8-1.redhat_00003.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8eap7-jboss-remoting, 0:5.0.31-3.SP2_redhat_00001.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8eap7-jboss-server-migration, 0:1.10.0-46.Final_redhat_00044.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8eap7-netty, 0:4.1.135-1.Final_redhat_00001.1.el8eapaffected
Weakness

CWE details

CWE-120

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-120 · source CWE mapping

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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