Rustls: Brotli certificate decompression can allocate an attacker-controlled amount of memory up to 1 GiB before authentication.

影響: rust:rustls < 0.23.46 → 0.23.46, rust:rustls >= 0.24.0-dev.1, < 0.24.0-dev.2 → 0.24.0-dev.2

The built-in (but disabled by default) Brotli certificate decoder bounds the output buffer but accepts an input-selected history window. A header of five bytes can specify a 1 GiB window allocation. A peer can abort a process whose allocator cannot satisfy that request. A client must enable Brotli and connect to the peer; a server must enable Brotli and request a client certificate. Neither direction requires a trusted attacker certificate. Details rustls calls BrotliDecompress which enables Br…

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On 10/28/2026, 01:08 AM, GitHub Advisory Database published "Rustls: Brotli certificate decompression can allocate an attacker-controlled amount of memory up to 1 GiB before authentication." (type: Advisory). Severity is "Low" (low). Related technologies: Rust.