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Vulnerability record · CVE-2015-1855 · published 29 November 2019

CVE-2015-1855: Ruby-lang ruby improper input validation vulnerability

Ruby Lang · Ruby

verify_certificate_identity in the OpenSSL extension in Ruby before 2.0.0 patchlevel 645, 2.1.x before 2.1.6, and 2.2.x before 2.2.2 does not properly validate hostnames, which allows remote attackers to spoof servers via vectors related to (1) multiple wildcards, (1) wildcards in IDNA names, (3) case sensitivity, and (4) non-ASCII characters.

5.9 CVSS 3.1 Medium EPSS 2.8% · top 14.0% CWE-20 · Improper input validation
5.9CVSS 3.1 base score, v2 4.3
2.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

verify_certificate_identity in the OpenSSL extension in Ruby before 2.0.0 patchlevel 645, 2.1.x before 2.1.6, and 2.2.x before 2.2.2 does not properly validate hostnames, which allows remote attackers to spoof servers via vectors related to (1) multiple wildcards, (1) wildcards in IDNA names, (3) case sensitivity, and (4) non-ASCII characters.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.debian.org/security/2015/dsa-3245 Third Party Advisory
http://www.debian.org/security/2015/dsa-3246 Third Party Advisory
http://www.debian.org/security/2015/dsa-3247 Third Party Advisory
https://bugs.ruby-lang.org/issues/9644 Third Party Advisory
https://puppetlabs.com/security/cve/cve-2015-1855 Third Party Advisory
https://www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vulnerability/ Vendor Advisory
http://www.debian.org/security/2015/dsa-3245 Third Party Advisory
http://www.debian.org/security/2015/dsa-3246 Third Party Advisory
http://www.debian.org/security/2015/dsa-3247 Third Party Advisory
https://bugs.ruby-lang.org/issues/9644 Third Party Advisory
https://puppetlabs.com/security/cve/cve-2015-1855 Third Party Advisory
https://www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vulnerability/ Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2015-1855), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.