CVE intelligence

CVE-2020-26247

Vulnerability intelligence

Published Dec 30, 2020Sources checked Nov 12, 2026

4.3MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2020-26247 and is rated Medium severity with a CVSS score of 4.3. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Jun 30, 2026

CBL-Mariner Releases

Vendor-listed releases

1.19.4-1

CISA KEVNot listedBased on the latest collected catalog

EPSS1.2%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2020-26247?

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.

Source: NVD