CVE-2026-79771

MEDIUM 5.3

Nokogiri before 1.19.3 Memory Leak via XSLT Transform

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

Nokogiri versions before 1.19.3 contain a memory leak in the XSLT Stylesheet transform method when processing Ruby strings containing null bytes. Attackers can exploit this by passing attacker-controlled input with null bytes to transform parameters, causing heap allocations to leak and enabling denial of service against long-running processes.

CWE	CWE-401
Vendor	sparklemotion
Product	nokogiri
Published	Aug 25, 2026
Last Updated	Aug 25, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

sparklemotion / nokogiri

0 < 1.19.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-v2fc-qm4h-8hqv vulncheck.com: https://www.vulncheck.com/advisories/nokogiri-before-memory-leak-via-xslt-transform

Credits

🔍 Captainjack-kor flavorjones