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Fencer Vulns
high 7.5

CVE-2026-54428 json

Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK

published 2026-07-01 4 mo ago modified 2026-10-25 15 d ago also EUVD-2026-41095 , GHSA-v3jc-474w-2wm6

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits
0
none known

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.

Patch / fix

  • maven org.apache.httpcomponents.core5:httpcore5-h2 5.4.3, 5.5-beta2
  • httpcomponents-core5 Debian 14 5.4.3-1

debian advisories DEBIAN-CVE-2026-54428

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-54428 updated cvss 7.5

org.apache.httpcomponents.core5/httpcore5-h2: Apache HttpComponents Core: Denial of Service via oversized HTTP/2 HPACK header blocks

  • Red Hat OpenShift Developer Tools and Services jenkins, jenkins-2-plugins Red Hat build of Apache Camel 4 for Quarkus 3 httpcore5-h2 Red Hat build of Apicurio Registry 3 httpcore5-h2
    affected: workaround, no fix available
  • Red Hat build of Debezium 3 httpcore5-h2
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 9 jmc Red Hat streams for Apache Kafka 3 httpcore5-h2
    affected: workaround, no fix available
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-rhel9 4.2.0-14, cryostat/cryostat-agent-init-rhel9 0.7.0-12
    fixed: vendor fix RHSA-2026:68333
  • Red Hat OpenShift Developer Tools and Services 4.12 ocp-tools-4/jenkins-rhel8 1786628667
    fixed: vendor fix RHSA-2026:60247
  • Red Hat OpenShift Developer Tools and Services 4.13 ocp-tools-4/jenkins-rhel8 1786628681
    fixed: vendor fix RHSA-2026:60249
  • Red Hat OpenShift Developer Tools and Services 4.14 ocp-tools-4/jenkins-rhel8 1786533561
    fixed: vendor fix RHSA-2026:60248
  • Red Hat OpenShift Developer Tools and Services 4.15 ocp-tools-4/jenkins-rhel8 1786533565
    fixed: vendor fix RHSA-2026:60239
show 16 more
  • Red Hat OpenShift Developer Tools and Services 4.16 ocp-tools-4/jenkins-rhel9 1787125166
    fixed: vendor fix RHSA-2026:60251
  • Red Hat OpenShift Developer Tools and Services 4.17 ocp-tools-4/jenkins-rhel9 1787124635
    fixed: vendor fix RHSA-2026:60246
  • Red Hat OpenShift Developer Tools and Services 4.18 ocp-tools-4/jenkins-rhel9 1787125069
    fixed: vendor fix RHSA-2026:60250
  • Red Hat OpenShift Developer Tools and Services 4.19 ocp-tools-4/jenkins-rhel9 1787124632
    fixed: vendor fix RHSA-2026:60252
  • Red Hat OpenShift Developer Tools and Services 4.20 ocp-tools-4/jenkins-rhel9 1787124925
    fixed: vendor fix RHSA-2026:60259
  • Red Hat OpenShift Developer Tools and Services 4.21 ocp-tools-4/jenkins-rhel9 1787125311
    fixed: vendor fix RHSA-2026:60254
  • Red Hat OpenShift Developer Tools and Services 4.22 ocp-tools-4/jenkins-rhel9 1787124779
    fixed: vendor fix RHSA-2026:60256
  • Red Hat Build of Apache Camel 3.33.2.SP3 httpcore5-h2 5.3.6.redhat-00002
    fixed: vendor fix RHSA-2026:48118
  • Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16
    fixed: vendor fix RHSA-2026:54622
  • Red Hat OpenShift AI 2.25 rhoai/odh-modelmesh-rhel9 1790881700
    fixed: vendor fix RHSA-2026:87410
  • Red Hat OpenShift Dev Spaces 3.30 devspaces/openvsx-rhel9 1787759145, devspaces/pluginregistry-rhel9 1787759723
    fixed: vendor fix RHSA-2026:62260
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-db-rhel9 4.2.0-22, cryostat/jfr-datasource-rhel9 4.2.0-14, cryostat/cryostat-reports-rhel9 4.2.0-14, cryostat/cryostat-storage-rhel9 4.2.0-22, cryostat/cryostat-rhel9-operator 4.2.0-21, cryostat/cryostat-operator-bundle 4.2.0-12, +2 more Red Hat OpenShift Developer Tools and Services 4.12 ocp-tools-4/jenkins-agent-base-rhel8 1786628706 Red Hat OpenShift Developer Tools and Services 4.13 ocp-tools-4/jenkins-agent-base-rhel8 1786628711 Red Hat OpenShift Developer Tools and Services 4.14 ocp-tools-4/jenkins-agent-base-rhel8 1786628748 Red Hat OpenShift Developer Tools and Services 4.15 ocp-tools-4/jenkins-agent-base-rhel8 1786628726 Red Hat OpenShift Developer Tools and Services 4.16 ocp-tools-4/jenkins-agent-base-rhel9 1787124634
    +8 more products
    Red Hat OpenShift Developer Tools and Services 4.17 ocp-tools-4/jenkins-agent-base-rhel9 1787124986 Red Hat OpenShift Developer Tools and Services 4.18 ocp-tools-4/jenkins-agent-base-rhel9 1787124633 Red Hat OpenShift Developer Tools and Services 4.19 ocp-tools-4/jenkins-agent-base-rhel9 1787124663 Red Hat OpenShift Developer Tools and Services 4.20 ocp-tools-4/jenkins-agent-base-rhel9 1787125493 Red Hat OpenShift Developer Tools and Services 4.21 ocp-tools-4/jenkins-agent-base-rhel9 1787125679 Red Hat OpenShift Developer Tools and Services 4.22 ocp-tools-4/jenkins-agent-base-rhel9 1787125563 Red Hat AI Inference Server rhaii/vllm-gaudi-rhel9, rhaiis/vllm-cuda-rhel9 Red Hat AMQ Clients httpcore5-h2
    not affected: vulnerable code not present
  • Red Hat build of Apache Camel - HawtIO 4 httpcore5-h2
    not affected: component not present
  • Red Hat Build of Apache Camel 3.33.2.SP3 jimfs 1.1, jna 5.8.0, bcel 6.7.0, bson 5.6.4, gax 2.74.1, icu4j 78.2, +1630 more
    not affected: vulnerable code not present
  • Red Hat Data Grid 8 httpcore5-h2
    not affected: component not present
  • Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-gaudi-rhel9
    not affected: vulnerable code not present

5 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.87% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven org.apache.httpcomponents.core5:httpcore5-h2
<5.4.3
>=5.5-alpha1, <5.5-beta2
5.4.3
5.5-beta2

Affected products

  • Apache Software Foundation Apache HttpComponents Core

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.