A buffer-overread issue was discovered in StringIO 3.0.1, as distributed in Ruby 3.0.x through 3.0.6 and 3.1.x through 3.1.4. The ungetbyte and ungetc methods on a StringIO can read past the end of a string, and a subsequent call to StringIO.gets may return the memory value. 3.0.3 is the main fixed version; however, for Ruby 3.0 users, a fixed version is stringio 3.0.1.1, and for Ruby 3.1 users, a fixed version is stringio 3.0.1.2.
CVE ID: CVE-2024-27280
Vendor: n/a
Product: n/a
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 11.98% (scored less or equal to compared to others)
EPSS Date: 2025-03-14 (when was this score calculated)