Home/CVE/A command injection vulnerability in Nokogiri v1.10.3 and earlier allows commands to be executed in a subprocess via Rub
CVE

CVE-2019-5477

A command injection vulnerability in Nokogiri v1.10.3 and earlier allows commands to be executed in a subprocess via Rub

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.

CRITICAL · CVSS 9.8 EPSS 0.09316
Schedule remediation
  • EPSS percentile: top 7% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
▤

Affected Products & Versions

3
nokogiri<= 1.10.3
canonical ubuntu linuxall versions
debian linuxall versions
▤

Affected Packages

2
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
RubyGems nokogiri CRITICAL fixed in 1.10.4
RubyGems rexical CRITICAL fixed in 1.0.7
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · support@hackerone.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD16 Aug 2019 · 04:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

12
suse-csafopenSUSE-SU-2026:10356-1
suse-csafopenSUSE-SU-2025:14697-1
suse-csafopenSUSE-SU-2024:14174-1
suse-csafopenSUSE-SU-2024:11340-1
suse-csafopenSUSE-SU-2024:11912-1
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/sparklemotion/nokogiri/issues/1915PatchThird Party Advisory
https://github.com/tenderlove/rexical/blob/master/CHANGELOG.rdocRelease Notes
https://hackerone.com/reports/650835Permissions Required
https://lists.debian.org/debian-lts-announce/2019/09/msg00027.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00018.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00019.htmlMailing ListThird Party Advisory
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