CVE-2024-27280: ruby-3.1 Classic Buffer Overflow

Vulnerability summary

CVE-2024-27280 is a critical (CVSS 9.8) Classic Buffer Overflow vulnerability in ruby-3.1. EPSS estimates a 2.36% chance of exploitation in the next 30 days, higher than 83.5% of scored vulnerabilities.

Timeline

1. 08-05-2024
   PublishedVulnerability first disclosed.
2. 04-11-2025
   Last modifiedVulnerability information updated.

Description

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.

• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.