CVE-2020-26247: Debian Linux

Medium severity, CVSS 4.3. EPSS: 1.2% chance of exploitation in the next 30 days.

Nokogiri is a Rubygem providing HTML, XML, SAX, and Reader parsers with XPath and CSS selector support. In Nokogiri before version 1.11.0.rc4 there is an XXE vulnerability. 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. This behavior is counter to the security policy followed by Nokogiri maintainers, which is to treat all input as untrusted by default whenever possible. This is fixed in Nokogiri version 1.11.0.rc4.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only
• Nokogiri Nokogiri: before 1.11.0 (fixed in 1.11.0); version 1.11.0 only

Published 2020-12-30. Last modified 2026-06-17.