How severe is CVE-2026-57437?

CVE-2026-57437 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-57437 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-57437?

CVE-2026-57437 affects Nokogiri. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-57437?

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

Does CVE-2026-57437 have an EU (EUVD) identifier?

Yes. CVE-2026-57437 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39428.

When was CVE-2026-57437 published?

CVE-2026-57437 was published on 2026-06-25 and last updated on 2026-06-26.

CVE-2026-57437

CVE-2026-57437 is a medium-severity vulnerability in Nokogiri with a CVSS 3.x base score of 5.3. 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 5.3)
CVSS v4: 1.7
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39428
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, Nokogiri::XML::XPathContext did not keep its source document alive for garbage collection. If an XPathContext outlived its document and the document was collected, evaluating an XPath expression could read invalid memory and potentially segfault. This is only reachable when application code constructs an XPathContext directly and lets the document become unreachable while continuing to use the context. The normal Document#xpath, #css, and related search methods are not affected, and it is not triggerable by malicious document input. This vulnerability is fixed in 1.19.4.

Frequently asked questions

What is CVE-2026-57437?: Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri::XML::XPathContext did not keep its source document alive for garbage collection. If an XPathContext outlived its document and the document was collected, evaluating an XPath expression could read invalid memory and potentially segfault. This is only reachable when application code constructs an XPathContext directly and lets the document become unreachable while continuing to use the context. The normal Document#xpath, #css, and related search methods are not affected, and it is not triggerable by malicious document input. This vulnerability is fixed in 1.19.4.
How severe is CVE-2026-57437?: CVE-2026-57437 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-57437 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-57437?: CVE-2026-57437 affects Nokogiri. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-57437?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-57437 have an EU (EUVD) identifier?: Yes. CVE-2026-57437 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39428.
When was CVE-2026-57437 published?: CVE-2026-57437 was published on 2026-06-25 and last updated on 2026-06-26.

References

https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-p67v-3w7g-wjg7

Affected products (1)

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

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