CVE-2026-54428
Published:July 01, 2026
Updated:July 07, 2026
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.
Affected Packages
https://github.com/apache/httpcomponents-core.git (GITHUB):
Affected version(s) >=rel/v5.5-alpha1 <rel/v5.5-beta2Fix Suggestion:
Update to version rel/v5.5-beta2https://github.com/apache/httpcomponents-core.git (GITHUB):
Affected version(s) >=rel/v5.4 <rel/v5.4.3Fix Suggestion:
Update to version rel/v5.4.3org.apache.httpcomponents.core5:httpcore5-h2 (JAVA):
Affected version(s) >=5.0 <5.4.3Fix Suggestion:
Update to version 5.4.3org.apache.httpcomponents.core5:httpcore5-h2 (JAVA):
Affected version(s) >=5.5-alpha1 <5.5-beta2Fix Suggestion:
Update to version 5.5-beta2Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.59