CVE-2026-53598 Prompty: Arbitrary File Read via ${file:path} Reference Expansion

Prompty is a markdown file format .prompty for LLM prompts. Prior to 2.0.0-beta.2, Prompty loaders expanded $file:... references in .prompty frontmatter without enforcing that resolved paths stayed within the prompt directory or allowed roots, allowing an attacker-controlled prompt file to read...