What’s Vulnerable › Vulnerabilities

CVE-2026-79769: Nokogiri before 1.19.4 Invalid Memory Read via initialize_copy_with_args

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-25 · updated 2026-09-24
• Weakness: CWE-843

Description

Nokogiri versions before 1.19.4 contain a possible invalid (out-of-bounds) memory read in the protected internal Node#initialize_copy_with_args helper behind Node#dup and #clone, which unwrapped its source argument as an xmlNode without a type check. If application code calls this protected method with a non-Node argument (e.g., a Namespace), it reads an xmlNs out of bounds, crashing the process. This is only triggerable by a programming error and cannot be triggered by untrusted input or normal use of the public API. Only CRuby is affected. Version 1.19.4 adds a type check and raises TypeError.

Affected products

• sparklemotion nokogiri: before 1.19.4 — fixed in 1.19.4

How to fix

Upgrade to a fixed version: sparklemotion nokogiri 1.19.4. Check the vendor advisory for mitigations.

References

• https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-g9g8-vgvw-g3vf
• https://www.vulncheck.com/advisories/nokogiri-before-invalid-memory-read-via-initialize-copy-with-args

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