CVE-2026-79771

Nokogiri before 1.19.3 Memory Leak via XSLT Transform

Published Aug 25, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-v2fc-qm4h-8hqv Nokogiri XSLT transform has a memory leak
History
Type Values Removed Values Added
CPEs cpe:2.3:a:nokogiri:nokogiri:*:*:*:*:*:ruby:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Sparklemotion
Sparklemotion nokogiri
Vendors & Products Sparklemotion
Sparklemotion nokogiri
Type Values Removed Values Added
Description 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.
Title Nokogiri before 1.19.3 Memory Leak via XSLT Transform
First Time appeared Nokogiri
Nokogiri nokogiri
Weaknesses CWE-401
CPEs cpe:2.3:a:nokogiri:nokogiri:*:*:*:*:*:*:*:*
Vendors & Products Nokogiri
Nokogiri nokogiri
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Aug 25, 2026, 5:44 PM
Reserved
Aug 25, 2026, 2:29 PM
Status
Analyzed
Published
Aug 25, 2026, 4:17 PM
Modified
Sep 1, 2026, 2:55 PM
Severity
Moderate
Public date
Aug 25, 2026, 3:16 PM