CVE-2026-57437

MEDIUM

Nokogiri: Possible Use-After-Free when directly using `NokogirI::XML::XPathContext` beyond document lifetime

Title source: cna

Description

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri::XML::XPathContext did not keep its source document alive for garbage collection. If an XPathContext outlived its document and the document was collected, evaluating an XPath expression could read invalid memory and potentially segfault. This is only reachable when application code constructs an XPathContext directly and lets the document become unreachable while continuing to use the context. The normal Document#xpath, #css, and related search methods are not affected, and it is not triggerable by malicious document input. This vulnerability is fixed in 1.19.4.

References (1)

Core 1

Core References

X_Refsource_Confirm x_refsource_confirm

https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-p67v-3w7g-wjg7

Scores

CVSS v3 5.3

EPSS 0.0032

EPSS Percentile 24.6%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-416

Status published

Products (2)

nokogiri/nokogiri < 1.19.4

sparklemotion/nokogiri < 1.19.4

Published Jun 25, 2026

Tracked Since Jun 25, 2026