CVE-2026-55484: GUNO1928 Alos-HTTP

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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: before 0.0.0-20260617230736-314b6783e196 (fixed in 0.0.0-20260617230736-314b6783e196)

Published 2026-08-28. Last modified 2026-09-09.