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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-54399] org.apache.httpcomponents.core5/httpcore5: Apache HttpComponents Core: Denial of Service via excessive HTTP headers

This high-severity Red Hat Linux advisory covers CVE-2026-54399 affecting Cryostat 4 on RHEL 9, 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.

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CVE-2026-54399 Source published Source updated

VulniPulse record published Record updated

CVE-2026-54399
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser 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 messages with excessive number of headers / excessive header length This can lead to memory exhaustion in applications using the affected HTTP/1.1 message parser, impacting service availability.

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 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; and 25 more.

Affected versions
  • 5.4.2

Official advisory · high-confidence parse· fetched 20 days ago·verify at source

Fixed versions
  • cryostat/cryostat-agent-init-rhel9:0.7.0-12
  • cryostat/cryostat-rhel9:4.2.0-14
  • httpcore
  • httpcore5
  • 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
  • rhaiis/vllm-cuda-rhel9:1787860580
  • devspaces/openvsx-rhel9:1787759145
  • devspaces/pluginregistry-rhel9:1787759723
  • RHSA-2026:68333
  • 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
  • RHSA-2026:61627
  • RHSA-2026:62260

Official advisory · high-confidence parse· fetched 20 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • To mitigate this issue, configure an upstream proxy or web application firewall (WAF) to enforce limits on the number and length of HTTP headers. This prevents malformed requests from reaching and exhausting the vulnerable Apache HttpComponents Core component. Consult your proxy or WAF documentation for specific configuration. A service restart may be required for changes to take effect.

Official advisory · high-confidence parse· fetched 20 days ago·verify at source

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