CVE-2026-79771: Missing Release of Memory after Effective Lifetime in sparklemotion nokogiri
Description
Nokogiri versions before 1.19.3 have a memory leak vulnerability in the XSLT Stylesheet transform method when processing Ruby strings containing null bytes. This flaw allows attackers to cause heap allocations to leak by passing specially crafted input with null bytes, potentially leading to denial of service in long-running processes.
CVSS v4.0
Score 6.9medium
Affected software
sparklemotion
nokogiri
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-79771 is a memory leak vulnerability in the Nokogiri library (sparklemotion project) affecting versions prior to 1.19.3. The issue occurs in the XSLT Stylesheet transform method when it processes Ruby strings containing null bytes. An attacker can exploit this by supplying input with null bytes to transform parameters, causing heap allocations to leak and potentially resulting in denial of service conditions for applications using Nokogiri in long-running processes.
Potential Impact
The vulnerability can lead to denial of service by exhausting memory resources due to heap allocation leaks when processing malicious input containing null bytes. This affects applications using vulnerable Nokogiri versions that perform XSLT transformations on attacker-controlled input.
Mitigation Recommendations
Upgrade to Nokogiri version 1.19.3 or later where this memory leak issue is fixed. No other mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-25T14:29:43.528Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a8dba55acd9273b4965b684
Added to database: 08/25/2026, 15:52:53 UTC
Last enriched: 09/10/2026, 18:22:27 UTC
Last updated: 10/09/2026, 06:48:19 UTC
Views: 67
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