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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-54428] org.apache.httpcomponents.core5/httpcore5: org.apache.httpcomponents.core5/httpcore5-h2: Apache HttpComponents Core: Denial of Service via oversized HTTP/2 HPACK header blocks

This high-severity Red Hat Linux advisory covers CVE-2026-54428 affecting Cryostat 4 on RHEL 9, Red Hat Build of Apache Camel 3.33.2.SP3, Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-54428 Source published Source updated

VulniPulse record published Record updated

CVE-2026-54428
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

Summary

Allocation of resources without limits or throttling in the HTTP/2 HPACK decoder in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows an remote attacker to cause a denial of service through memory exhaustion by sending oversized compressed header blocks before the HTTP/2 SETTINGS acknowledgement causes the configured header list size limit to be applied.

This can lead to the affected system becoming unresponsive. This occurs before the system's configured header list size limits are applied, potentially rendering affected Red Hat products unresponsive.

Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770.

Affected products named by the advisory: Cryostat 4 on RHEL 9; Red Hat Build of Apache Camel 3.33.2.SP3; Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16; OpenShift Developer Tools and Services 4.12; and 19 more.

Is CVE-2026-54428 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-54428 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-54428?

Upgrade to a fixed release named by Red Hat:

  • cryostat/cryostat-agent-init-rhel9:0.7.0-12
  • cryostat/cryostat-rhel9:4.2.0-14
  • org.apache.httpcomponents.core5/httpcore5-h2:5.3.6.redhat-00002
  • httpcore5-h2
  • ocp-tools-4/jenkins-rhel8:1786628667
  • ocp-tools-4/jenkins-rhel8:1786628681
  • ocp-tools-4/jenkins-rhel8:1786533561
  • ocp-tools-4/jenkins-rhel8:1786533565
  • ocp-tools-4/jenkins-rhel9:1787125166
  • ocp-tools-4/jenkins-rhel9:1787124635
  • ocp-tools-4/jenkins-rhel9:1787125069
  • ocp-tools-4/jenkins-rhel9:1787124632

22 more fixed releases are listed below.

Confirm against the vendor advisory before you patch.

Affected versions
  • < 5.4.2
  • < 5.5-beta1

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Fixed versions
  • cryostat/cryostat-agent-init-rhel9:0.7.0-12
  • cryostat/cryostat-rhel9:4.2.0-14
  • org.apache.httpcomponents.core5/httpcore5-h2:5.3.6.redhat-00002
  • httpcore5-h2
  • ocp-tools-4/jenkins-rhel8:1786628667
  • ocp-tools-4/jenkins-rhel8:1786628681
  • ocp-tools-4/jenkins-rhel8:1786533561
  • ocp-tools-4/jenkins-rhel8:1786533565
  • ocp-tools-4/jenkins-rhel9:1787125166
  • ocp-tools-4/jenkins-rhel9:1787124635
  • ocp-tools-4/jenkins-rhel9:1787125069
  • ocp-tools-4/jenkins-rhel9:1787124632
  • ocp-tools-4/jenkins-rhel9:1787124925
  • ocp-tools-4/jenkins-rhel9:1787125311
  • ocp-tools-4/jenkins-rhel9:1787124779
  • rhoai/odh-modelmesh-rhel9:1790881700
  • devspaces/openvsx-rhel9:1787759145
  • devspaces/pluginregistry-rhel9:1787759723
  • RHSA-2026:68333
  • RHSA-2026:48118
  • RHSA-2026:54622
  • RHSA-2026:60247
  • RHSA-2026:60249
  • RHSA-2026:60248
  • RHSA-2026:60239
  • RHSA-2026:60251
  • RHSA-2026:60246
  • RHSA-2026:60250
  • RHSA-2026:60252
  • RHSA-2026:60259
  • RHSA-2026:60254
  • RHSA-2026:60256
  • RHSA-2026:87410
  • RHSA-2026:62260

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • 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.

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

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