CVE-2026-57234: Nokogiri is an open source XML and HTML library for the Ruby programming language

Q: How do I fix CVE-2026-57234?

nokogiri: upgrade to 1.19.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-57234 being exploited?

CVE-2026-57234 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-57234 affect?

CVE-2026-57234 affects nokogiri. Severity is low (CVSS 2.6). 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

Q: How urgent is CVE-2026-57234?

Priority 11/100. No elevated risk signals yet.

Routine

LOW 2.6UPGRADE

CVE-2026-57234 is a low-severity flaw (CVSS 2.6) affecting nokogiri. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 fixe

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	2.6 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-178, CWE-184, CWE-611
Published	2026-06-25
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: nokogiri

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-25 15:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

nokogiri nokogiri UPGRADE

Affected: < 1.19.4

Fixed in: 1.19.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nokogiri || rpm -q nokogiri || nokogiri --version

2. UPGRADE to 1.19.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nokogiri

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nokogiri

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-57234?

nokogiri: upgrade to 1.19.4. Exact commands for each OS are on this page.

Is CVE-2026-57234 being exploited?

CVE-2026-57234 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-57234 affect?

CVE-2026-57234 affects nokogiri. Severity is low (CVSS 2.6). 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

How urgent is CVE-2026-57234?

Priority 11/100. No elevated risk signals yet.

Software pages

Ruby vulnerabilities

Related CVEs

CVE-2026-57235 HIGH 8.2 UPGRADE Nokogiri is an open source XML and HTML library for the Ruby programming language
CVE-2026-57236 HIGH 8.2 UPGRADE Nokogiri is an open source XML and HTML library for the Ruby programming language
CVE-2026-57434 HIGH 7.5 UPGRADE Nokogiri is an open source XML and HTML library for the Ruby programming language
CVE-2026-57435 HIGH 7.5 UPGRADE Nokogiri is an open source XML and HTML library for the Ruby programming language
CVE-2026-57436 MEDIUM 5.3 UPGRADE Nokogiri is an open source XML and HTML library for the Ruby programming language

References

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