CVE-2026-57436CWE-416

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

Low · published June 25, 2026

CVSS v4.0
1.7
EPSS
0%
Percentile
33.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
1.7 · LOW
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
EPSS
0.00402 · 33.3th percentile
Weakness
CWE-416 · Use After Free
Published
2026-06-25T14:33Z
EPSS history
Timeline
  • 25 JUN 14:33Z
    Nokogiri: Possible Use-After-Free when setting `Document#root=` to an invalid node type
    cvelistv5