JLSEC-2026-711 Stack Buffer Overflow in `wc_HpkeLabeledExtract` via Oversized ECH Config

Stack Buffer Overflow in wcHpkeLabeledExtract via Oversized ECH Config. A vulnerability existed in wolfSSL 5.8.4 ECH Encrypted Client Hello support, where a maliciously crafted ECH config could cause a stack buffer overflow on the client side, leading to potential remote execution and client...

Out-of-bounds Write

Overview Affected versions of this package are vulnerable to Out-of-bounds Write in the wcHpkeLabeledExtract function when processing an oversized ECH configuration. An attacker can cause a client crash or achieve remote code execution by sending a maliciously crafted ECH config from a TLS server...