CVE-2026-57436

MEDIUM

Nokogiri: Possible Use-After-Free when setting `Document#root=` to an invalid node type

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 5.3
EPSS 0.0032
EPSS Percentile 24.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-416
Status published
Products (2)
nokogiri/nokogiri < 1.19.4
sparklemotion/nokogiri < 1.19.4
Published Jun 25, 2026
Tracked Since Jun 25, 2026