CVE-2026-54428: high-severity vulnerability in Apache HttpComponents Core
Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK
Published
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.9%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Apache Software Foundation · Apache HttpComponents CoreRelated CVEs — Apache HttpComponents Core
In the same product, most dangerous first.