Answer in brief
CVE-2026-79771 records a Medium severity (CVSS 5.3) vulnerability in Nokogiri before 1.19.3 Memory Leak via XSLT Transform. The current sources do not mark it as known exploited. The current feed maps sparklemotion/nokogiri (generic), nokogiri (rubygems), nokogiri (rubygems). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps sparklemotion/nokogiri (generic), nokogiri (rubygems), nokogiri (rubygems). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:nokogiri:nokogiri:*:*:*:*:*:ruby:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| sparklemotion/nokogirigeneric | >=0 <1.19.3 | 1.19.3 |
| nokogirirubygems | >=0 <1.19.3 | 1.19.3 |
| nokogirirubygems | <1.19.3 | 1.19.3 |
Published upstream
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
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.
Quoted source text, attributed separately from HOL analysis.