Description
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.
Published: 2026-08-25
Score: 9.3 Critical
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 25 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 25 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Nokogiri before 1.18.3 Stack Buffer Overflow and Use-After-Free
First Time appeared Nokogiri
Nokogiri nokogiri
Weaknesses CWE-787
CPEs cpe:2.3:a:nokogiri:nokogiri:*:*:*:*:*:*:*:*
Vendors & Products Nokogiri
Nokogiri nokogiri
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Nokogiri Nokogiri
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-25T16:10:55.763Z

Reserved: 2026-07-18T12:38:41.077Z

Link: CVE-2025-71407

cve-icon Vulnrichment

Updated: 2026-08-25T16:10:52.589Z

cve-icon NVD

Status : Received

Published: 2026-08-25T16:16:45.633

Modified: 2026-08-25T17:17:04.863

Link: CVE-2025-71407

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-25T16:30:06Z

Weaknesses