Offensive-security firm Calif, with discovery work performed by OpenAI's Codex software agent, has disclosed HTTP/2 Bomb, a denial-of-service attack that crashes web servers from a single machine in seconds. It works against default HTTP/2 configurations of NGINX, Apache, Microsoft IIS, Envoy, and Cloudflare Pingora. The technique combines HPACK header-compression amplification (one attacker byte triggering thousands of bytes of server allocation, up to 5,700:1 on Envoy) with Slowloris-style flow-control stalling via zero-byte windows that prevents the memory from ever being freed. A home computer on a 100 Mbps link can force Apache or Envoy to hold 32 GB of RAM in roughly 20 seconds, bypassing existing header-size defenses.
Team Xint Code has disclosed CVE-2026-23479, a use-after-free remote code execution flaw in Redis that sat unnoticed in every stable branch from 7.2.0 until the May 5 fixes - over two years. The bug lives in unblockClientOnKey(), which keeps using a client pointer after processCommandAndResetClient() can free it. Exploitation needs an authenticated session, but Wiz's analysis finds Redis in most cloud environments with the majority running passwordless, where the default user already holds every privilege the exploit chain requires. The published exploit leaks a heap pointer via Lua, reclaims a freed client with a fake structure, and overwrites a GOT entry to repoint strcasecmp() at system(). NVD rates it 8.8.
An AI-discovered bug hidden in NGINX since 2008 lets anyone on the internet crash NGINX worker processes or, with ASLR disabled, run code on the server using a single crafted HTTP request. The flaw, named NGINX Rift (CVE-2026-42945, CVSS 9.2), sits in the rewrite module that powers URL rewriting in almost every NGINX deployment. It triggers when a config uses a rewrite directive with unnamed regex captures and a question mark, followed by another rewrite, if, or set directive - a common pattern in API gateway setups. NGINX runs roughly a third of the websites on the public internet.
TrustStrike Labs