CVE-2026-79771: Nokogiri

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Nokogiri Nokogiri: before 1.19.3 (fixed in 1.19.3)

Published 2026-08-25. Last modified 2026-09-01.