Hackney has an infinite loop on non-token byte at start of an Alt-Svc entry

Summary CVE-2026-47066 is an infinite loop CWE-835 in hackney's Alt-Svc response header parser src/hackneyaltsvc.erl. When an HTTP server returns an Alt-Svc header whose value begins with a non-token byte e.g. !, @, =, ;, the parser enters a tight tail-recursive loop that pins an Erlang scheduler...

The vulnerability of the Firefox browser, which allows a violator to trigger a service failure

The vulnerability of the Firefox browser’s HTTP/2 implementation arises from the loss of a significant number of bits. Exploiting this vulnerability allows an attacker to cause a service failure remotely by triggering a “Assertion failure” error message and a premature termination of the service...