What is CVE-2017-6181?

CVE-2017-6181 is a high-severity vulnerability in Ruby-Lang Ruby, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2017-04-03.

How severe is CVE-2017-6181?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Ruby-Lang Ruby

CVE-2017-6181

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2017-04-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.036 (89.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.036 · newest: 0.036 · change: 0.000

Affected products

Ruby-Lang Ruby — versions 2.4.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

bugs.ruby-lang.org/issues/13234 (Issue Tracking, Vendor Advisory)
bugs.ruby-lang.org/projects/ruby-trunk/repository/revisions/57660 (Issue Tracking, Vendor Advisory)
www.securityfocus.com/bid/97304 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2017-6181?: CVE-2017-6181 is a high-severity vulnerability in Ruby-Lang Ruby, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2017-04-03.
How severe is CVE-2017-6181?: High severity. CVSS v3 base score is 7.5 out of 10.