Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK
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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-54428US | — | — | ||
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… | ||||
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references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2026/07/01/3WEB
- https://github.com/apache/httpcomponents-corePACKAGE
- https://github.com/apache/httpcomponents-core/commit/1ea1239bbbe3442a8382a87279c0a8119a7e358eWEB
- https://github.com/apache/httpcomponents-core/commit/cc30ee058a7b10cbf4ad3dd6270ab6d1f6a74c49WEB
- https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sdWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-54428ADVISORY
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