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Fencer Vulns
low 2.6

CVE-2026-57234 json

Nokogiri: XML::Schema on JRuby allows network requests when NONET is set, bypassing CVE-2020-26247

published 2026-06-19 4 mo ago modified 2026-10-25 14 d ago also GHSA-8678-w3jw-xfc2 , EUVD-2026-39421

cvss
2.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, the NONET parse option, which Nokogiri turns on by default for Nokogiri::XML::Schema (see CVE-2020-26247), was not correctly enforced on the JRuby implementation. As a result, a schema parsed with default options could still cause external resources to be fetched over the network, potentially enabling SSRF or XXE attacks. This vulnerability is fixed in 1.19.4.

Patch / fix

  • rubygems nokogiri 1.19.4
  • nokogiri nokogiri 1.19.4
  • ruby-nokogiri Debian 14 1.19.4+dfsg-1

debian advisories DEBIAN-CVE-2026-57234

  • ruby-nokogiri Alpine 3.24 1.19.4-r0

alpine advisories ALPINE-CVE-2026-57234

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • rubygem-nokogiri Azure Linux 3.0 1.19.4-1

azure linux advisories AZL-91080

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-57234 updated cvss 4.8

nokogiri: Nokogiri: Server-Side Request Forgery (SSRF) and XML External Entity (XXE) via improper enforcement of NONET parse option

  • Red Hat 3scale API Management Platform 2 3scale-amp21/zync, 3scale-amp22/zync, 3scale-amp21/system, 3scale-amp22/system, 3scale-amp21/backend, 3scale-amp22/backend, +9 more Red Hat Satellite 6 rubygem-nokogiri
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 2.6 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
GitHub 3.1 2.6 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
rubygems nokogiri
<1.19.4
1.19.4

Affected products

  • sparklemotion nokogiri

Classification

Weakness
  • CWE-178 Improper Handling of Case Sensitivity
  • CWE-184 Incomplete List of Disallowed Inputs
  • CWE-611 Improper Restriction of XML External Entity Reference

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.