CVE-2020-26247

Name	CVE-2020-26247
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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2678-1, DLA-3149-1, ELA-438-1
Debian Bugs	978967

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
ruby-nokogiri (PTS)	jessie, jessie (lts)	1.6.3.1+ds-1+deb8u3	fixed
	stretch (security), stretch (lts), stretch	1.6.8.1-1+deb9u2	fixed
	buster (security), buster, buster (lts)	1.10.0+dfsg1-2+deb10u1	fixed
	bullseye	1.11.1+dfsg-2	fixed
	bullseye (security)	1.11.1+dfsg-2+deb11u1	fixed
	bookworm	1.13.10+dfsg-2	fixed
	sid, trixie	1.16.4+dfsg-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
ruby-nokogiri	source	jessie	1.6.3.1+ds-1+deb8u2		ELA-438-1
ruby-nokogiri	source	stretch	1.6.8.1-1+deb9u1		DLA-2678-1
ruby-nokogiri	source	buster	1.10.0+dfsg1-2+deb10u1		DLA-3149-1
ruby-nokogiri	source	(unstable)	1.11.1+dfsg-1	low		978967

Notes

https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-vr8q-g5c7-m54m
https://github.com/sparklemotion/nokogiri/commit/9c87439d9afa14a365ff13e73adc809cb2c3d97b (v1.11.0.rc4)