CVE-2020-26247

Name: CVE-2020-26247
Creator: NVD / NIST
Published: 2020-12-30T19:15:12.92+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 1.29%

Last modified Jun 17, 2026

CVE-2020-26247 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 1.29% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

1.29%

66.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Nokogiri	Nokogiri	< 1.11.0	—
Nokogiri	Nokogiri	1.11.0	Rc1
Debian	Debian Linux	9.0	—
Debian	Debian Linux	10.0	—

References

https://github.com/sparklemotion/nokogiri/commit/9c87439d9afa14a365ff13e73adc809cb2c3d97bPatch, Third Party Advisory
https://github.com/sparklemotion/nokogiri/releases/tag/v1.11.0.rc4Release Notes, Third Party Advisory
https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-vr8q-g5c7-m54mMitigation, Third Party Advisory
https://hackerone.com/reports/747489Permissions Required
https://lists.debian.org/debian-lts-announce/2021/06/msg00007.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00018.htmlMailing List, Third Party Advisory
https://rubygems.org/gems/nokogiriProduct, Third Party Advisory
https://security.gentoo.org/glsa/202208-29Third Party Advisory
https://github.com/sparklemotion/nokogiri/commit/9c87439d9afa14a365ff13e73adc809cb2c3d97bPatch, Third Party Advisory
https://github.com/sparklemotion/nokogiri/releases/tag/v1.11.0.rc4Release Notes, Third Party Advisory
https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-vr8q-g5c7-m54mMitigation, Third Party Advisory
https://hackerone.com/reports/747489Permissions Required
https://lists.debian.org/debian-lts-announce/2021/06/msg00007.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00018.htmlMailing List, Third Party Advisory
https://rubygems.org/gems/nokogiriProduct, Third Party Advisory
https://security.gentoo.org/glsa/202208-29Third Party Advisory

Timeline

Published: Dec 30, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26247?

How severe is CVE-2020-26247?

CVE-2020-26247 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 1.29% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26247?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26247?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST