Is CVE-2026-57436 actively exploited?

No active exploitation of CVE-2026-57436 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-57436 be exploited remotely?

Yes. CVE-2026-57436 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-57436?

CVE-2026-57436 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-57436

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

5.3

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::XML::Document#root= validated only that the new root was a Nokogiri::XML::Node, allowing a DTD node to be set as the document root. The result is a heap use-after-free during garbage collection or finalization, leading to an invalid memory read or potentially a segfault. This vulnerability is fixed in 1.19.4.

NVD Source

Technical Analysis

CVE-2026-57436 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.

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