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-$5k2.47-

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.

Upgrading to version 1.19.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at 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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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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
Price Prediction: 🔍
Current Price Estimation: 🔒

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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
06/25/2026 +0 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: 06/25/2026 18:56
Changes: 06/25/2026 16:56 (69), 06/25/2026 18:56 (1)
Complete: 🔍
Cache ID: 216::103

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