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CVE-2026-54428— Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK

AI Predicted 7.5 Difficulty: Easy EPSS 0.59% · P45

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProductVersion RangeStatus
Apache Software FoundationApache HttpComponents Core5.5-alpha≤ 5.5-beta1affected
5.0-alpha≤ 5.4.2affected
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I. Basic Information for CVE-2026-54428

Vulnerability Information
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Vulnerability Title
Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Apache HttpComponents Core 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Apache HttpComponents Core是美国Apache基金会开源的一个HTTP组件核心库。 Apache HttpComponents Core存在资源管理错误漏洞，该漏洞源于HTTP/2 HPACK解码器中资源分配无限制或节流，允许远程攻击者通过在HTTP/2 SETTINGS确认应用配置的标头列表大小限制之前发送过大的压缩标头块，导致内存耗尽拒绝服务。以下版本受到影响：5.4.2及之前版本和5.5-beta1及之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Apache Software FoundationApache HttpComponents Core 5.5-alpha ~ 5.5-beta1 -

II. Public POCs for CVE-2026-54428

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III. Intelligence Information for CVE-2026-54428

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Mailing List Discussions for CVE-2026-54428 (1)

IV. Related Vulnerabilities

Same product: Apache HttpComponents Core
Same vendor: Apache Software Foundation
Same weakness: CWE-770

V. Comments for CVE-2026-54428

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