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.

CVE-2026-55484 affects ALOS HTTP, a Linux-first Go web framework and application server. The vulnerability exists in core/utils.go::sanitizeRequestPath, which fails to validate whether the path resulting from splitPathQuery is empty when the request path begins with a question mark. An unauthenticated attacker can send a malformed request with a question-mark-only path via multiple protocol handlers (HTTP/1, HTTPS, HTTP/3), triggering an out-of-bounds array access panic. This panic occurs before the core.Recovery() middleware can intercept it, causing the entire server process to terminate. The vulnerability results in a denial-of-service condition requiring no authentication. The issue is patched in pseudo-version 0.0.0-20260617230736-314b6783e196, available via the referenced GitHub commit.