GHSA-9vwc-pc8p-253q Http4s Ember HTTP/2 does not enforce SETTINGS_MAX_CONCURRENT_STREAMS

• Maven org.http4s:http4s-ember-core_2.12: < 0.23.35 → fixed in 0.23.35 • Maven org.http4s:http4s-ember-core_2.13: < 0.23.35 → fixed in 0.23.35 • Maven org.http4s:http4s-ember-core_3: < 0.23.35 → fixed in 0.23.35 • Maven org.http4s:http4s-ember-core_2.13: >= 1.0.0-M1, < 1.0.0-M47 → fixed in 1.0.0-M47 • Maven org.http4s:http4s-ember-core_3: >= 1.0.0-M1, < 1.0.0-M47 → fixed in 1.0.0-M47

An ember server with HTTP/2 enabled (`.withHttp2`) does not enforce `SETTINGS_MAX_CONCURRENT_STREAMS` on streams opened by the peer. A single unauthenticated connection can open an unbounded number of concurrent streams, each of which allocates per-stream server state that is never released, exhausting the heap. Impact Unauthenticated remote denial of service (memory exhaustion) against any Ember server built `.withHttp2`. This is the resource-exhaustion class of the HTTP/2 "Rapid Reset" family (CVE-2023-44487). The same unchecked allocation path is reachable on the client via server-initiated `PUSH_PROMISE` frames, so a malicious or compromised server can exhaust an ember-client's heap the same way. Preconditions • Server: with `.withHttp2` enabled. • Client: makes HTTP/2 requests to malicious or compromised sites. `enablePush` is not enforced. Workarounds • Disable HTTP/2 on `EmberServerBuilder` or `EmberClientBuilder` (default) • Client only: avoid HTTP/2 to untrusted servers until patched.