OSV-2025-298 Heap-buffer-overflow in i18n::phonenumbers::UnicodeText::const_iterator::operator--

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=413161357 Crash type: Heap-buffer-overflow READ 1 Crash state: i18n::phonenumbers::UnicodeText::constiterator::operator-- i18n::phonenumbers::UnicodeString::tempSubString...