# CVE-2026-55484

## Summary

- **CVE ID:** CVE-2026-55484
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-248, CWE-754
- **Published:** Aug 28, 2026
- **Last Modified:** Aug 28, 2026

## 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.

## Affected Products

- guno1928 — alos-http (< 0.0.0-20260617230736-314b6783e196)

## References

- [CNA](https://github.com/guno1928/alos-http/security/advisories/GHSA-hr6j-w4mw-g9mj)
- [CNA](https://github.com/guno1928/alos-http/commit/314b6783e19698c85ea9d9b197ff52f7f6a3a374)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.34%
- **EPSS Percentile:** 27.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._