TI-2026-55248 Aliases CVE-2026-79771 GHSA-v2fc-qm4h-8hqv

Nokogiri before 1.19.3 Memory Leak via XSLT Transform

LOW 37CWE-401Published 2026-08-25 · Updated 2026-08-25

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · Low
Fix status: Partial Red Hat: 2 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-401.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00423 36th percentileScored 2026-11-07

Fix Partial nokogiri (sparklemotion): 1.19.3nokogiri (RubyGems): 1.19.3Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
sparklemotion	nokogiri	before 1.19.3	1.19.3	Patch available	CNA
—	nokogiri (RubyGems)	before 1.19.3	1.19.3	Patch available	GHSA-v2fc-qm4h-8hqv

nokogiri Vendorsparklemotion Affected before 1.19.3 Fixed in 1.19.3 Patch available CNA
nokogiri (RubyGems) Vendor— Affected before 1.19.3 Fixed in 1.19.3 Patch available GHSA-v2fc-qm4h-8hqv

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:nokogiri:nokogiri::::::ruby::*	before 1.19.3	Vulnerable	sparklemotion

cpe:2.3:a:nokogiri:nokogiri:*:*:*:*:*:ruby:*:* Versions before 1.19.3 Vulnerable ·sparklemotion

Remediation

Fix · CNA nokogiri (sparklemotion) Fixed in 1.19.3
Fix · GHSA-v2fc-qm4h-8hqv nokogiri (RubyGems) Fixed in 1.19.3 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-08-25
sparklemotion nokogiri 1.19.3
2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2026-55247 Nokogiri before 1.19.3 ReDoS via CSS selector tokenizerPriority MEDIUM 44
Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat 3scale API Management Platform 2	Affected	No fix yet: Fix deferred
Red Hat Satellite 6	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-79771
2026-10-03 Alias added: GHSA-v2fc-qm4h-8hqv

References

Advisory 2

Other 1

https://github.com/sparklemotion/nokogiri

TI-2022-11724 Improper Handling of Unexpected Data Type in Nokogiri CVSS 3.1HIGH 8.2
TI-2018-15259 zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if… CVSS 3.1HIGH 7.5
TI-2019-03885 OS command injection in Nokogiri CVSS 3.1CRITICAL 9.8
TI-2026-55247 Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer CVSS 4.0HIGH 8.7
TI-2022-07536 Unchecked return value from xmlTextReaderExpand in Nokogiri CVSS 3.1HIGH 7.5
TI-2022-08648 Inefficient Regular Expression Complexity in Nokogiri CVSS 3.1HIGH 7.5

See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences