ghsa-p67v-3w7g-wjg7
CVSS 1.7 osv_rubygems### Summary `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. Nokogiri 1.19.4 makes `XPathContext` keep its source document alive for as long as the context exists. Only the CRuby implementation is affected. JRuby is not affected. ### Severity The Nokogiri maintainers have evaluated this as low severity. Reaching it requires an unusual API-usage pattern that does not arise during normal use. The application must construct an `XML::XPathContext` directly and continue using it after allowing its source document to be garbage-collected. Nokogiri 1.19.4 makes this pattern safe with no change to the public API. The context now keeps its source document alive for as long as it exists. ### Mitigation Upgrade to Nokogiri 1.19.4 or later. As a workaround, ensure the source document remains referenced for as long as any `XPathContext` created from it is in use. The standard `Document#xpath`, `#css`, and related search methods already do this and are unaffected. ### Credit This issue was responsibly reported by Zheng Yu from depthfirst.com.
- Published
- unknown
- Last Modified
- unknown
CVSS details not available.
No product information available.
No linked vulnerabilities found.
{
"affected": [
{
"database_specific": {
"source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-p67v-3w7g-wjg7/GHSA-p67v-3w7g-wjg7.json"
},
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"purl": "pkg:gem/nokogiri"
},
"ranges": [
{
"events": [
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{
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}
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}
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}
],
"aliases": [
"CVE-2026-57437"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": true,
"github_reviewed_at": "2026-06-19T16:37:13Z",
"nvd_published_at": null,
"severity": "LOW"
},
"details": "### Summary\n\n`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.\n\nThis 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.\n\nNokogiri 1.19.4 makes `XPathContext` keep its source document alive for as long as the context exists.\n\nOnly the CRuby implementation is affected. JRuby is not affected.\n\n### Severity\n\nThe Nokogiri maintainers have evaluated this as low severity. Reaching it requires an unusual API-usage pattern that does not arise during normal use. The application must construct an `XML::XPathContext` directly and continue using it after allowing its source document to be garbage-collected. Nokogiri 1.19.4 makes this pattern safe with no change to the public API. The context now keeps its source document alive for as long as it exists.\n\n### Mitigation\n\nUpgrade to Nokogiri 1.19.4 or later.\n\nAs a workaround, ensure the source document remains referenced for as long as any `XPathContext` created from it is in use. The standard `Document#xpath`, `#css`, and related search methods already do this and are unaffected.\n\n### Credit\n\nThis issue was responsibly reported by Zheng Yu from depthfirst.com.",
"id": "GHSA-p67v-3w7g-wjg7",
"modified": "2026-09-10T03:51:09.256741560Z",
"published": "2026-06-19T16:37:13Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-p67v-3w7g-wjg7"
},
{
"type": "PACKAGE",
"url": "https://github.com/sparklemotion/nokogiri"
}
],
"schema_version": "1.9.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear",
"type": "CVSS_V4"
}
],
"summary": "Nokogiri: Possible Use-After-Free when directly using `NokogirI::XML::XPathContext` beyond document lifetime"
}