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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 1.11.1+dfsg-1 |
| sid | Fixed | 1.11.1+dfsg-1 |
| forky | Fixed | 1.11.1+dfsg-1 |
| bullseye | Fixed | 1.11.1+dfsg-1 |
| bookworm | Fixed | 1.11.1+dfsg-1 |
References
- https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-vr8q-g5c7-m54m
- https://www.suse.com/security/cve/CVE-2020-26247.html
- https://nvd.nist.gov/vuln/detail/CVE-2020-26247
- https://github.com/sparklemotion/nokogiri/commit/9c87439d9afa14a365ff13e73adc809cb2c3d97b
- https://hackerone.com/reports/747489
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/CVE-2020-26247.yml
- https://github.com/sparklemotion/nokogiri
- https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md#v1110--2021-01-03
- https://github.com/sparklemotion/nokogiri/releases/tag/v1.11.0.rc4
- https://lists.debian.org/debian-lts-announce/2021/06/msg00007.html
- https://lists.debian.org/debian-lts-announce/2022/10/msg00018.html
- https://rubygems.org/gems/nokogiri
- https://security.gentoo.org/glsa/202208-29
- https://security-tracker.debian.org/tracker/CVE-2020-26247
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.