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CVE-2026-55484— ALOS HTTP: Unauthenticated remote DoS: malformed path starting with "?" triggers out-of-bounds panic in sanitizeRequestPath, crashing entire server

Quick assessment

Affected
guno1928 alos-http
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ALOS HTTP 是一个以自定义网络栈为核心构建的、面向 Linux 环境的 Go 语言 Web 框架和应用服务器。在版本 0.0.0-20260617230736-314b6783e196 之前， 中的 函数会对以问号（ ）开头的请求路径调用 ，随后在未检查返回路径是否为空的情况下直接访问 ，导致数组越界。 未认证的攻击者可以发送畸形请求（例如仅包含一个问号的路径，即 ），这些请求会经过 、 、 或 等处理路径，从而在 中间件运行之前触发数组越界导致的 panic，最终致使服务器进程终止。 该问题已在伪版本 0

CVSS 7.5 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
guno1928 alos-http < 0.0.0-20260617230736-314b6783e196 affected
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I. Basic Information for CVE-2026-55484

Vulnerability Information
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Vulnerability Title
ALOS HTTP: Unauthenticated remote DoS: malformed path starting with "?" triggers out-of-bounds panic in sanitizeRequestPath, crashing entire server
Source: CVE Program / CVE List V5
Vulnerability Description
ALOS HTTP is a Linux-first Go web framework and application server built around a custom networking stack. Prior to 0.0.0-20260617230736-314b6783e196, core/utils.go::sanitizeRequestPath calls splitPathQuery on a request path beginning with a question mark and then performs the unchecked p[0] access without checking whether the resulting path is empty. An unauthenticated client can send a malformed request such as a question-mark-only path through h1_plain.go::ParseH1RequestHead, hpack.go::decodeSimpleGetPathHTTPSRequest, hpack.go::observeHeader, or h3_conn.go::handleRequestStream, causing an out-of-bounds panic before core.Recovery() middleware runs and terminating the server process. This issue is fixed in pseudo-version 0.0.0-20260617230736-314b6783e196.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
guno1928 alos-http < 0.0.0-20260617230736-314b6783e196 -

II. Public POCs for CVE-2026-55484

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III. Intelligence Information for CVE-2026-55484

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Vendor Advisories for CVE-2026-55484 (1)

Other References for CVE-2026-55484 (1)

IV. Related Vulnerabilities

Same weakness: CWE-248

V. Comments for CVE-2026-55484

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