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 Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16, Red Hat Build of Apache Camel 4.18 for Quarkus 3.33, Red Hat build of Quarkus 3.33.2.SP3.
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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: Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16; Red Hat Build of Apache Camel 4.18 for Quarkus 3.33; Red Hat build of Quarkus 3.33.2.SP3; OpenShift Developer Tools and Services 4.12; and 18 more.
- < 5.4.2
- < 5.5-beta1
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
- 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
- RHSA-2026:54622
- RHSA-2026:48118
- RHSA-2026:47172
- 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
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- 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 12 days ago·verify at source
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