CVE-2017-11465: Ruby-Lang Ruby

Critical severity, CVSS 9.8. EPSS: 1.7% chance of exploitation in the next 30 days.

The parser_yyerror function in the UTF-8 parser in Ruby 2.4.1 allows attackers to cause a denial of service (invalid write or read) or possibly have unspecified other impact via a crafted Ruby script, related to the parser_tokadd_utf8 function in parse.y. NOTE: this might have security relevance as a bypass of a $SAFE protection mechanism.

Affected products

• Ruby-Lang Ruby: version 2.4.1 only

Published 2017-07-19. Last modified 2026-06-17.