PYSEC-2026-4323 Out-of-bounds write in the brotlicffi decoder ("Node2Shell") also affects the PyPI Brotli package

CVE-2026-111497 "Node2Shell" is an out-of-bounds write CWE-787 in Google's Brotli decoder c/dec/decode.c. DecodeBlockTypeAndLength returns an ambiguous value for an invalid block switch, and the fast decode path discards it CWE-252, unchecked return value, so a crafted Brotli stream makes the...