GO-2026-6720 yopass Prometheus metrics middleware allows remote memory exhaustion through unbounded method labels in github.com/jhaals/yopass

yopass Prometheus metrics middleware allows remote memory exhaustion through unbounded method labels in github.com/jhaals/yopass...

PT-2026-118036

yopass Prometheus metrics middleware allows remote memory exhaustion through unbounded method labels in github.com/jhaals/yopass...

yopass Prometheus metrics middleware allows remote memory exhaustion through unbounded method labels

The Prometheus metrics middleware in pkg/server/server.go used r.Method directly as a label value on request counter and duration histogram metrics. Since the mux catch-all route matches any HTTP method, an unauthenticated attacker can send requests with arbitrary method strings e.g. curl -X "M1"...