GitPython: Newline injection in config_writer() section parameter bypasses CVE-2026-42215 patch, enabling RCE via core.hooksPath

Summary The patch for CVE-2026-42215 GitPython 3.1.49 validates newlines only in the value parameter of setvalue. The section and option parameters are passed to configparser without any newline validation. An attacker who controls the section argument can inject \n to write arbitrary section...