CVE-2017-6181

7.5 highEPSS 3.6%

The parse_char_class function in regparse.c in the Onigmo (aka Oniguruma-mod) regular expression library, as used in Ruby 2.4.0, allows remote attackers to cause a denial of service (deep recursion and application crash) via a crafted regular expression.

Severity

CVSS 3.0

7.5 high

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 3.6% chance of exploitation in the next 30 days; higher than 89% of CVEs (scores of 2026-10-31)
CWE: CWE-20
Published: 2017-04-03
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

ruby-lang:ruby

References

http://www.securityfocus.com/bid/97304
https://bugs.ruby-lang.org/issues/13234
https://bugs.ruby-lang.org/projects/ruby-trunk/repository/revisions/57660
http://www.securityfocus.com/bid/97304
https://bugs.ruby-lang.org/issues/13234

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