High [CVE-2026-54428] Allocation of resources without limits or throttling in the HTTP/2 HPACK decoder in Apache HttpComponents Core (5.4.2 and…
This high-severity Apache Software Foundation advisory covers CVE-2026-54428 affecting Apache HttpComponents Core.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
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.
Is CVE-2026-54428 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-54428 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-54428?
The advisory VulniPulse tracks names no fixed release. Follow Apache's guidance for workarounds and updates.
Confirm against the vendor advisory before you patch.
- 5.4.2
Official advisory · high-confidence parse· fetched 4 months ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 4 months ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 4 months ago·verify at source
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