SB2020123029 - XML External Entity injection in Nokogiri
Published: December 30, 2020 Updated: September 30, 2025
Security Bulletin ID
SB2020123029
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) XML External Entity injection (CVE-ID: CVE-2020-26247)
The vulnerability allows a remote user to gain access to sensitive information.
The vulnerability exists due to XML Schemas parsed by Nokogiri::XML::Schema are trusted by default, allowing external resources to be accessed over the network, potentially enabling XXE or SSRF attacks. A remote user can pass a specially crafted XML code to the affected application and view contents of arbitrary files on the system or initiate requests to external systems.
Remediation
Install update from vendor's website.