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  4. CVE 2026 81624 undertow core undertow websocketcontainer
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Back to active CVEs
High · CVSS 7.5CVE-2026-81624

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

Answer in brief

CVE-2026-81624 records a High severity (CVSS 7.5) vulnerability in Undertow-core: undertow: websocketcontainer defaults for buffers and timeouts are infinite. The current sources do not mark it as known exploited. The current feed maps Red Hat/jboss-eap-7/eap74-els-openjdk11-openshift-rhel8 (generic), Red Hat/jboss-eap-7/eap74-els-openjdk17-openshift-rhel8 (generic), Red Hat/jboss-eap-7/eap74-els-openjdk8-openshift-rhel8 (generic), Red Hat/undertow-core (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 31, 2026Updated Sep 10, 2026Source checked Oct 15, 2026First seen by HOL Aug 31, 2026Material review Sep 10, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/jboss-eap-7/eap74-els-openjdk11-openshift-rhel8 (generic), Red Hat/jboss-eap-7/eap74-els-openjdk17-openshift-rhel8 (generic), Red Hat/jboss-eap-7/eap74-els-openjdk8-openshift-rhel8 (generic), Red Hat/undertow-core (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/jboss-eap-7/eap74-els-openjdk11-openshift-rhel8generic*Not reported
Red Hat/jboss-eap-7/eap74-els-openjdk17-openshift-rhel8generic*Not reported
Red Hat/jboss-eap-7/eap74-els-openjdk8-openshift-rhel8generic*Not reported
Red Hat/undertow-coregeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/jboss-eap-7/eap74-els-openjdk11-openshift-rhel8, Red Hat/jboss-eap-7/eap74-els-openjdk17-openshift-rhel8, Red Hat/jboss-eap-7/eap74-els-openjdk8-openshift-rhel8.
  2. 2Review the reported fix. Source-reported workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Evidence timeline and material changes

  1. Published upstream

    Aug 31, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 31, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Wildfly-core: wildfly-core: deployer rbac role privilege escalation via path traversal in deployment nameSame red hat/jboss-eap-7/eap74-els-openjdk11-openshift-rhel8 package
  • kin-openapi deepObject query decoding repeatedly compiles an invariant regular expressionAlso CWE-770
  • Lychee: A single 383-byte PDF causes ~184 seconds of CPU consumption in the real processing pathAlso CWE-770
  • Lychee: Missing Authentication for Critical Function and Allocation of Resources Without Limits or Throttling on /docs/apiAlso CWE-770
  • kin-openapi: Unauthenticated panic (DoS) in openapi3filter legacy router via non-canonical/unsupported HTTP method on a static pathSame generic ecosystem
  • kin-openapi spec loader panics on a self-referential additionalProperties $ref (nil-pointer DoS)Same generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-770
Source
CVE List V5
Source checked
Oct 15, 2026
References
2 linked sources
Open source record