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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.

guno1928 alos-http是guno1928个人开发者的一款网络操作系统。 guno1928 alos-http 0.0.0-20260617230736-314b6783e196之前版本存在异常处理不当漏洞，该漏洞源于core/utils.go::sanitizeRequestPath函数处理以问号开头的请求路径时，调用splitPathQuery后未检查结果路径是否为空即执行p[0]访问，可能导致未经身份验证的攻击者发送畸形请求，触发越界panic，从而终止服务器进程，造成拒绝服务。

CVSS 7.5 · High EPSS 0.49% · P42 Updated Aug 29, 2026

Possible ATT&CK Techniques 2 AI

T1029 · Scheduled Transfer T1480 · Execution Guardrails

Affected Version Matrix 1

Vendor	Product	Version Range	Status
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

Vulnerability Title

guno1928 alos-http 异常处理不当漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

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

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

II. Public POCs for CVE-2026-55484

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-55484

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Vendor Advisories for CVE-2026-55484 (1)

🔗 Unauthenticated remote DoS: malformed path starting with "?" triggers out-of-bounds panic in sanitizeRequestPath, crashing entire server · Advisory · guno1928/alos-http · GitHub Read full article x_refsource_CONFIRM

https://www.cve.org/CVERecord?id=CVE-2026-55484

IV. Related Vulnerabilities

Same weakness: CWE-248