ANT-2026-PGRNAV88 · Spark · other

other critical Severity Claude critical · Security research firm - · Maintainer - Discovered by Claude Mythos Preview REPORT Anthropic's analysis of this finding, sealed at approval. ANT-2026-PGRNAV88: spark rce UserDefinedType.fromJson in python/pyspark/sql/types.py:2002 passes bytes taken from...