sparklemotion nokogiri up to 1.19.3 Garbage Collection Document#root= use after free

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in sparklemotion nokogiri up to 1.19.3. Affected is the function Nokogiri::XML::Document#root= of the component Garbage Collection Handler. Executing a manipulation can lead to use after free. This vulnerability is registered as CVE-2026-57436. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in sparklemotion nokogiri up to 1.19.3 and classified as critical. This vulnerability affects the function Nokogiri::XML::Document#root= of the component Garbage Collection Handler. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect availability. CVE summarizes:

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 advisory is shared for download at github.com. This vulnerability was named CVE-2026-57436 since 06/24/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 323617 (Linux Distros Unpatched Vulnerability : CVE-2026-57436), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.19.4 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (323617) and EUVD (EUVD-2026-39427). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 323617
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-57436

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: nokogiri 1.19.4

Timelineinfo

06/24/2026 CVE reserved
06/25/2026 +1 days Advisory disclosed
06/25/2026 +0 days VulDB entry created
06/29/2026 +4 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-57436 (🔒)
GCVE (CVE): GCVE-0-2026-57436
GCVE (VulDB): GCVE-100-373900
EUVD: 🔒

Entryinfo

Created: 06/25/2026 16:56
Updated: 06/29/2026 16:44
Changes: 06/25/2026 16:56 (69), 06/25/2026 18:56 (1), 06/29/2026 16:44 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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