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Vulnerability record · CVE-2019-5477 · published 16 August 2019

CVE-2019-5477: Nokogiri os command injection vulnerability

Nokogiri · Nokogiri

A command injection vulnerability in Nokogiri v1.10.3 and earlier allows commands to be executed in a subprocess via Ruby's `Kernel.open` method. Processes are vulnerable only if the undocumented method `Nokogiri::CSS::Tokenizer#load_file` is being called with unsafe user input as the filename. This vulnerability appears in code generated by the Rexical gem versions v1.0.6 and earlier. Rexical is used by Nokogiri to generate lexical scanner code for parsing CSS queries. The underlying vulnerability was addressed in Rexical v1.0.7 and Nokogiri upgraded to this version of Rexical in Nokogiri v1.10.4.

9.8 CVSS 3.1 Critical EPSS 5.9% · top 7.0% CWE-78 · OS command injection
9.8CVSS 3.1 base score, v2 7.5
5.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

Description

A command injection vulnerability in Nokogiri v1.10.3 and earlier allows commands to be executed in a subprocess via Ruby's `Kernel.open` method. Processes are vulnerable only if the undocumented method `Nokogiri::CSS::Tokenizer#load_file` is being called with unsafe user input as the filename. This vulnerability appears in code generated by the Rexical gem versions v1.0.6 and earlier. Rexical is used by Nokogiri to generate lexical scanner code for parsing CSS queries. The underlying vulnerability was addressed in Rexical v1.0.7 and Nokogiri upgraded to this version of Rexical in Nokogiri v1.10.4.

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

Affected products

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

References

LinkTags
https://github.com/sparklemotion/nokogiri/issues/1915 PatchThird Party Advisory
https://github.com/tenderlove/rexical/blob/master/CHANGELOG.rdoc Release Notes
https://hackerone.com/reports/650835 Permissions Required
https://lists.debian.org/debian-lts-announce/2019/09/msg00027.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00018.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00019.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202006-05 Third Party Advisory
https://usn.ubuntu.com/4175-1/ Third Party Advisory
https://github.com/sparklemotion/nokogiri/issues/1915 PatchThird Party Advisory
https://github.com/tenderlove/rexical/blob/master/CHANGELOG.rdoc Release Notes
https://hackerone.com/reports/650835 Permissions Required
https://lists.debian.org/debian-lts-announce/2019/09/msg00027.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00018.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00019.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202006-05 Third Party Advisory
https://usn.ubuntu.com/4175-1/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-5477), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.