{
"id": "GHSA-593j-84wv-vpv9",
"aliases": [
"CVE-2021-47996"
],
"details": "Nokogiri before 1.11.4 (CRuby implementation only, when the packaged/vendored libxml2 is used) bundles libxml2 2.9.10, which is affected by multiple vulnerabilities addressed in libxml2 2.9.12, including a memory leak in xmlSchemaValidateStream (CVE-2019-20388), a global buffer over-read in xmlEncodeEntitiesInternal (CVE-2020-24977), a heap-based buffer overflow (CVE-2021-3517), and an out-of-bounds read (CVE-2021-3518). Processing crafted XML documents may lead to denial of service, information disclosure, or memory corruption.",
"affected": [],
"modified": "2026-08-28T18:31:23Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
}
],
"published": "2026-08-25T18:31:49Z",
"references": [
{
"url": "https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-7rrm-v45f-jp64",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47996",
"type": "ADVISORY"
},
{
"url": "https://github.com/sparklemotion/nokogiri/commit/bf22713507fe1fc3a2c4b525cf0a88c2dc87a3a2",
"type": "WEB"
},
{
"url": "https://github.com/sparklemotion/nokogiri/commit/babe75030c7f64a37826bb3342317134568bef61",
"type": "WEB"
},
{
"url": "https://github.com/sparklemotion/nokogiri/commit/8598060bacada41a0eb09d95c97744ff4e428f8e",
"type": "WEB"
},
{
"url": "https://github.com/sparklemotion/nokogiri/commit/7ffcd44d7e6c46704f8af0321d9314cd26e0e18a",
"type": "WEB"
},
{
"url": "https://github.com/sparklemotion/nokogiri/commit/50f06b3efb638efb0abd95dc62dca05ae67882c2",
"type": "WEB"
},
{
"url": "https://github.com/sparklemotion/nokogiri/commit/1358d157d0bd83be1dfe356a69213df9fac0b539",
"type": "WEB"
},
{
"url": "https://github.com/sparklemotion/nokogiri/commit/1098c30a040e72a4654968547f415be4e4c40fe7",
"type": "WEB"
},
{
"url": "https://github.com/sparklemotion/nokogiri/commit/0e1a49c8907645d2e155f0d89d4d9895ac5112b5",
"type": "WEB"
},
{
"url": "https://github.com/GNOME/libxml2/commit/bf22713507fe1fc3a2c4b525cf0a88c2dc87a3a2",
"type": "WEB"
},
{
"url": "https://github.com/GNOME/libxml2/commit/babe75030c7f64a37826bb3342317134568bef61",
"type": "WEB"
},
{
"url": "https://github.com/GNOME/libxml2/commit/8598060bacada41a0eb09d95c97744ff4e428f8e",
"type": "WEB"
},
{
"url": "https://github.com/GNOME/libxml2/commit/7ffcd44d7e6c46704f8af0321d9314cd26e0e18a",
"type": "WEB"
},
{
"url": "https://github.com/GNOME/libxml2/commit/50f06b3efb638efb0abd95dc62dca05ae67882c2",
"type": "WEB"
},
{
"url": "https://github.com/GNOME/libxml2/commit/1358d157d0bd83be1dfe356a69213df9fac0b539",
"type": "WEB"
},
{
"url": "https://github.com/GNOME/libxml2/commit/1098c30a040e72a4654968547f415be4e4c40fe7",
"type": "WEB"
},
{
"url": "https://github.com/GNOME/libxml2/commit/0e1a49c8907645d2e155f0d89d4d9895ac5112b5",
"type": "WEB"
},
{
"url": "https://www.vulncheck.com/advisories/nokogiri-before-multiple-vulnerabilities-via-libxml2",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-119"
],
"severity": "HIGH",
"github_reviewed": false,
"nvd_published_at": "2026-08-25T16:16:42Z",
"github_reviewed_at": null
}
}