Use After Free Affecting nokogiri package, versions [,1.19.4)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-NOKOGIRI-17391924
- published21 Jun 2026
- disclosed19 Jun 2026
- creditZheng Yu
Introduced: 19 Jun 2026
CVE-2026-57436 (opens in a new tab)How to fix?
Upgrade nokogiri to version 1.19.4 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free in the Document#root=. An attacker can cause invalid memory reads or potentially a segmentation fault by assigning a non-element node, such as a DTD, as the document root.
Note: This is only exploitable if application code explicitly assigns a non-element node to Document#root=; it cannot be triggered by untrusted input or normal API usage.
Workaround
This vulnerability can be mitigated by avoiding assignment of non-element nodes, such as DTDs, via Document#root=.