# CVE-2023-54354

## Summary

- **CVE ID:** CVE-2023-54354
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-476
- **Published:** Aug 25, 2026
- **Last Modified:** Sep 8, 2026

## Description

Nokogiri before 1.14.3 (CRuby implementation only, when using the packaged libxml2) bundles libxml2 v2.10.3, which is vulnerable to NULL pointer dereferences in XML Schema processing (xmlSchemaFixupComplexType, CVE-2023-28484, and xmlSchemaCheckCOSSTDerivedOK). An attacker who supplies a crafted/malformed XML schema can cause libxml2 to dereference a NULL pointer and potentially segfault, resulting in a denial of service. Nokogiri 1.14.3 upgrades the packaged libxml2 to v2.10.4 to resolve these issues.

## Affected Products

- sparklemotion — nokogiri (0)
- sparklemotion — nokogiri (1.14.3)

## References

- [CNA](https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-pxvg-2qj5-37jq)
- [CNA](https://github.com/sparklemotion/nokogiri/commit/09a2dd453007f9c7205274623acdd73747c22d64)
- [CNA](https://github.com/sparklemotion/nokogiri/commit/647e072ea0a2f12687fa05c172f4c4713fdb0c4f)
- [CNA](https://github.com/sparklemotion/nokogiri/commit/4c6922f763ad958c48ff66f82823ae21f2e92ee6)
- [CNA](https://www.vulncheck.com/advisories/nokogiri-before-null-pointer-dereference-via-libxml2)
- [CNA](https://github.com/GNOME/libxml2/commit/09a2dd453007f9c7205274623acdd73747c22d64)
- [CNA](https://github.com/GNOME/libxml2/commit/647e072ea0a2f12687fa05c172f4c4713fdb0c4f)
- [CNA](https://github.com/GNOME/libxml2/commit/4c6922f763ad958c48ff66f82823ae21f2e92ee6)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.35%
- **EPSS Percentile:** 28.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._