UBUNTU-CVE-2020-26247

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    UBUNTU-CVE-2020-26247

    Published: 30 Dec 2020Last Modified: 5 Feb 2026
    Upstream:
    CVE-2020-26247
    Aliases:
    USN-7659-1

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2020-26247, https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-vr8q-g5c7-m54m, https://github.com/sparklemotion/nokogiri/commit/9c87439d9afa14a365ff13e73adc809cb2c3d97b, https://github.com/sparklemotion/nokogiri/commit/9c87439d9afa14a365ff13e73adc809cb2c3d97b, https://github.com/sparklemotion/nokogiri/releases/tag/v1.11.0.rc4, https://hackerone.com/reports/747489, https://rubygems.org/gems/nokogiri, https://www.cve.org/CVERecord?id=CVE-2020-26247, https://ubuntu.com/security/notices/USN-7659-1

    Affected packages

    Package

    Name: ruby-nokogiri

    Purl: pkg:deb/ubuntu/[email protected]+dfsg1-2ubuntu0.1~esm2?arch=source&distro=esm-apps/focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.10.7+dfsg1-2ubuntu0.1~esm2

    Affected versions

    1.10.3+dfsg1-2
    1.10.4+dfsg1-1
    1.10.7+dfsg1-1
    1.10.7+dfsg1-2
    1.10.7+dfsg1-2build1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2020-26247 | CVE-DB