GHSA-v2fc-qm4h-8hqv: Nokogiri XSLT transform has a memory leak

May 6, 2026 (updated September 2, 2026)

Nokogiri’s Nokogiri::XSLT::Stylesheet#transform leaks a small heap allocation when passed a Ruby string parameter containing a null byte.

For applications that pass attacker-controlled input through XSLT.transform parameters, this may be a vector for a denial of service attack against long-running processes.

References

github.com/advisories/GHSA-v2fc-qm4h-8hqv
github.com/sparklemotion/nokogiri/security/advisories/GHSA-v2fc-qm4h-8hqv
nvd.nist.gov/vuln/detail/CVE-2026-79771
www.vulncheck.com/advisories/nokogiri-before-memory-leak-via-xslt-transform

Code Behaviors & Features

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