# CVE-2025-71407

## Summary

- **CVE ID:** CVE-2025-71407
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (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)
- **CWE:** CWE-787
- **Published:** Aug 25, 2026
- **Last Modified:** Sep 1, 2026

## 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.

## Affected Products

- sparklemotion — nokogiri (0)
- sparklemotion — nokogiri (1.18.3)

## References

- [CNA](https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-vvfq-8hwr-qm4m)
- [CNA](https://www.vulncheck.com/advisories/nokogiri-before-stack-buffer-overflow-and-use-after-free)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.42%
- **EPSS Percentile:** 34.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._