Vulnerabilities in pkg:maven/org.apache.httpcomponents.core5/httpcore5-h2
PACKAGECVE-2026-54428 is a HIGH (CVSS 7.5) hpackdecoder unlimited header list size vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Apache HttpComponents Core libraries in the Maven ecosystem. The issue involves hpackdecoder unlimited header list size before settings ack. Remediation is available by upgrading affected packages to version 5.4.3, 5.5-beta2.
pkg:maven/org.apache.httpcomponents.core5/httpcore5-h2
Vulnerability advisories affecting package pkg:maven/org.apache.httpcomponents.core5/httpcore5-h2. Select an advisory below to view technical details or fixes.
| Advisory ID | CVE / NVD | Severity | Summary |
|---|---|---|---|
| GHSA-v3jc-474w-2wm6 | CVE-2026-54428 | HIGH | Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK |
CVE-2026-54428 at a Glance
Security Impact
CVSS: 7.5
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
How to Fix CVE-2026-54428
To remediate this vulnerability, upgrade all affected Apache HttpComponents Core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>org.apache.httpcomponents.core5</groupId>
<artifactId>httpcore5-h2</artifactId>
<version>5.4.3</version>
</dependency><dependency>
<groupId>org.apache.httpcomponents.core5</groupId>
<artifactId>httpcore5-h2</artifactId>
<version>5.5-beta2</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=org.apache.httpcomponents.core5How to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-54428, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.apache.httpcomponents.core5Analyze the terminal output to locate any version of Apache HttpComponents Core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.4.3), your application is affected.
Note: The mvn dependency:tree -Dincludes=org.apache.httpcomponents.core5 command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Apache HttpComponents Core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-54428 Affected Apache HttpComponents Core Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.apache.httpcomponents.core5:httpcore5-h2
|
Maven |
< 5.4.3
|
5.4.3
|
|
org.apache.httpcomponents.core5:httpcore5-h2
|
Maven |
≥ 5.5-alpha1
< 5.5-beta2
|
5.5-beta2
|
References
Frequently Asked Questions
What is CVE-2026-54428?
Which Apache HttpComponents Core versions are affected?
What version fixes CVE-2026-54428?
Is httpcore5-h2 affected?
What is the CVSS score of CVE-2026-54428?
What CWE is associated with CVE-2026-54428?
How can I check Maven dependencies for CVE-2026-54428?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-v3jc-474w-2wm6",
"modified" : "2026-08-13T18:27:16Z",
"published" : "2026-07-01T18:31:56Z",
"aliases" : [ "CVE-2026-54428" ],
"summary" : "Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK",
"details" : "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.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.apache.httpcomponents.core5:httpcore5-h2"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "5.4.3"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "org.apache.httpcomponents.core5:httpcore5-h2"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "5.5-alpha1"
}, {
"fixed" : "5.5-beta2"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-54428"
}, {
"type" : "WEB",
"url" : "https://github.com/apache/httpcomponents-core/commit/1ea1239bbbe3442a8382a87279c0a8119a7e358e"
}, {
"type" : "WEB",
"url" : "https://github.com/apache/httpcomponents-core/commit/cc30ee058a7b10cbf4ad3dd6270ab6d1f6a74c49"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/apache/httpcomponents-core"
}, {
"type" : "WEB",
"url" : "https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd"
}, {
"type" : "WEB",
"url" : "http://www.openwall.com/lists/oss-security/2026/07/01/3"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-400" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-08-13T18:27:16Z",
"nvd_published_at" : "2026-07-01T18:16:34Z"
}
}