# CVE-2026-79772

## Summary

- **CVE ID:** CVE-2026-79772
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-252
- **Published:** Aug 25, 2026
- **Last Modified:** Aug 28, 2026

## Description

Nokogiri versions before 1.19.1 fail to check the return value from xmlC14NExecute in the canonicalize method, returning an empty string on failure instead of raising an exception. Attackers can exploit this to bypass signature validation in downstream SAML libraries by providing invalid canonicalized XML that is incorrectly accepted as valid.

## Affected Products

- sparklemotion — nokogiri (1.5.1)
- sparklemotion — nokogiri (1.19.1)

## References

- [CNA](https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-wx95-c6cv-8532)
- [CNA](https://www.vulncheck.com/advisories/nokogiri-before-unchecked-return-value-canonicalize)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.25%
- **EPSS Percentile:** 15.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._