Is CVE-2026-57435 actively exploited?

No active exploitation of CVE-2026-57435 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-57435 be exploited remotely?

Yes. CVE-2026-57435 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-57435?

CVE-2026-57435 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-57435

HIGH

CVE-2026-57435

CWE-416Published: June 25, 2026· Updated: Jun 26, 2026

7.5

CVSS v3.1

EPSS:0.33%probability of exploitation in 30 daysPercentile:25.0th

Official 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.

NVD Source

Technical Analysis

CVE-2026-57435 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.