How severe is CVE-2026-57438?

CVE-2026-57438 has a CVSS 3.x base score of 6.6, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.

Is CVE-2026-57438 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-57438?

CVE-2026-57438 affects Nokogiri. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-57438?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-57438 have an EU (EUVD) identifier?

Yes. CVE-2026-57438 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39429.

When was CVE-2026-57438 published?

CVE-2026-57438 was published on 2026-06-25 and last updated on 2026-06-26.

CVE-2026-57438

CVE-2026-57438 is a medium-severity vulnerability in Nokogiri with a CVSS 3.x base score of 6.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

Severity: Medium (CVSS 3.x base score 6.6)
CVSS v4: 2.2
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39429
Weakness: CWE-416
Affected product: Nokogiri
Published: 2026-06-25
Last modified: 2026-06-26

Description

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, XInclude substitution performed by Nokogiri::XML::Node#do_xinclude replaced each <xi:include> in place, freeing the include node along with its children (such as <xi:fallback> and its descendants) and any namespaces declared on them. If an application had already exposed one of those nodes or namespaces to Ruby, the corresponding Ruby object was left pointing at freed memory. Using the object could result in invalid reads or writes to memory. This vulnerability is fixed in 1.19.4.

Frequently asked questions

What is CVE-2026-57438?: Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, XInclude substitution performed by Nokogiri::XML::Node#do_xinclude replaced each <xi:include> in place, freeing the include node along with its children (such as <xi:fallback> and its descendants) and any namespaces declared on them. If an application had already exposed one of those nodes or namespaces to Ruby, the corresponding Ruby object was left pointing at freed memory. Using the object could result in invalid reads or writes to memory. This vulnerability is fixed in 1.19.4.
How severe is CVE-2026-57438?: CVE-2026-57438 has a CVSS 3.x base score of 6.6, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.
Is CVE-2026-57438 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-57438?: CVE-2026-57438 affects Nokogiri. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-57438?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-57438 have an EU (EUVD) identifier?: Yes. CVE-2026-57438 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39429.
When was CVE-2026-57438 published?: CVE-2026-57438 was published on 2026-06-25 and last updated on 2026-06-26.

References

https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-wfpw-mmfh-qq69

Affected products (1)

cpe:2.3:a:nokogiri:nokogiri:*:*:*:*:*:ruby:*:*

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