Vulnerability Details CVE-2026-54428
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.009
EPSS Ranking 57.4%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-54428
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cpe:2.3:a:apache:httpcomponents_core:5.0
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cpe:2.3:a:apache:httpcomponents_core:5.0.1
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cpe:2.3:a:apache:httpcomponents_core:5.0.2
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cpe:2.3:a:apache:httpcomponents_core:5.0.3
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cpe:2.3:a:apache:httpcomponents_core:5.0.4
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cpe:2.3:a:apache:httpcomponents_core:5.1
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cpe:2.3:a:apache:httpcomponents_core:5.1.1
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cpe:2.3:a:apache:httpcomponents_core:5.1.2
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cpe:2.3:a:apache:httpcomponents_core:5.1.3
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cpe:2.3:a:apache:httpcomponents_core:5.1.4
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cpe:2.3:a:apache:httpcomponents_core:5.1.5
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cpe:2.3:a:apache:httpcomponents_core:5.2
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cpe:2.3:a:apache:httpcomponents_core:5.2.1
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cpe:2.3:a:apache:httpcomponents_core:5.2.2
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cpe:2.3:a:apache:httpcomponents_core:5.2.3
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cpe:2.3:a:apache:httpcomponents_core:5.2.4
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cpe:2.3:a:apache:httpcomponents_core:5.2.5
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cpe:2.3:a:apache:httpcomponents_core:5.3
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cpe:2.3:a:apache:httpcomponents_core:5.3.1
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cpe:2.3:a:apache:httpcomponents_core:5.3.2
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cpe:2.3:a:apache:httpcomponents_core:5.3.3
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cpe:2.3:a:apache:httpcomponents_core:5.3.4
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cpe:2.3:a:apache:httpcomponents_core:5.3.5
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cpe:2.3:a:apache:httpcomponents_core:5.3.6
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cpe:2.3:a:apache:httpcomponents_core:5.4
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cpe:2.3:a:apache:httpcomponents_core:5.4.1
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cpe:2.3:a:apache:httpcomponents_core:5.4.2
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cpe:2.3:a:apache:httpcomponents_core:5.5