sparklemotion Nokogiri up to 1.18.2 libxml2 stack-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.31

Summaryinfo

A vulnerability categorized as critical has been discovered in sparklemotion Nokogiri up to 1.18.2. Affected by this issue is some unknown functionality of the component libxml2. The manipulation results in stack-based overflow. This vulnerability was named CVE-2025-71407. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in sparklemotion Nokogiri up to 1.18.2. It has been classified as critical. Affected is an unknown functionality of the component libxml2. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Nokogiri before 1.18.3 contains a stack buffer overflow vulnerability in libxml2 when reporting DTD validation errors with long QName prefixes, and a use-after-free vulnerability during validation against untrusted XML Schemas. Attackers can trigger these vulnerabilities by providing malicious DTD content or untrusted XSD files to cause denial of service or potential code execution.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2025-71407 since 07/18/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

Upgrading to version 1.18.3 eliminates this vulnerability.

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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: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.8
CNA Vector (VulnCheck): 🔒

CVSSv2info

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

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / 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 1.18.3

Timelineinfo

07/18/2026 CVE reserved
08/25/2026 +38 days Advisory disclosed
08/25/2026 +0 days VulDB entry created
08/25/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2025-71407 (🔒)
GCVE (CVE): GCVE-0-2025-71407
GCVE (VulDB): GCVE-100-395088

Entryinfo

Created: 08/25/2026 17:42
Changes: 08/25/2026 17:42 (76)
Complete: 🔍
Cache ID: 216::103

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