How severe is CVE-2026-57435?

CVE-2026-57435 has a CVSS 3.x base score of 7.5, rated high 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 high.

Is CVE-2026-57435 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-57435?

CVE-2026-57435 affects Nokogiri. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-57435?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-57435 have an EU (EUVD) identifier?

Yes. CVE-2026-57435 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39426.

When was CVE-2026-57435 published?

CVE-2026-57435 was published on 2026-06-25 and last updated on 2026-06-26.

CVE-2026-57435

CVE-2026-57435 is a high-severity vulnerability in Nokogiri with a CVSS 3.x base score of 7.5. 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: High (CVSS 3.x base score 7.5)
CVSS v4: 1.7
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39426
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’s CRuby native extension could leave a Ruby wrapper pointing to freed memory when replacing the value of an XML attribute. If Ruby code had already accessed an attribute child node, Nokogiri::XML::Attr#value= could free the underlying native child node while the wrapper remained reachable through the document node cache. A later use of the freed child node or a Ruby GC mark could dereference an invalid pointer, causing an invalid read and a possible segfault. This vulnerability is fixed in 1.19.4.

Frequently asked questions

What is CVE-2026-57435?: Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri’s CRuby native extension could leave a Ruby wrapper pointing to freed memory when replacing the value of an XML attribute. If Ruby code had already accessed an attribute child node, Nokogiri::XML::Attr#value= could free the underlying native child node while the wrapper remained reachable through the document node cache. A later use of the freed child node or a Ruby GC mark could dereference an invalid pointer, causing an invalid read and a possible segfault. This vulnerability is fixed in 1.19.4.
How severe is CVE-2026-57435?: CVE-2026-57435 has a CVSS 3.x base score of 7.5, rated high 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 high.
Is CVE-2026-57435 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-57435?: CVE-2026-57435 affects Nokogiri. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-57435?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-57435 have an EU (EUVD) identifier?: Yes. CVE-2026-57435 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39426.
When was CVE-2026-57435 published?: CVE-2026-57435 was published on 2026-06-25 and last updated on 2026-06-26.

References

https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-phwj-rprq-35pp

Affected products (1)

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

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