High severity7.5NVD Advisory· Published Aug 25, 2026
CVE-2021-47996
CVE-2021-47996
Description
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.
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Affected products
2- Range: <1.11.4
Patches
Vulnerability mechanics
References
10- github.com/sparklemotion/nokogiri/commit/0e1a49c8907645d2e155f0d89d4d9895ac5112b5nvd
- github.com/sparklemotion/nokogiri/commit/1098c30a040e72a4654968547f415be4e4c40fe7nvd
- github.com/sparklemotion/nokogiri/commit/1358d157d0bd83be1dfe356a69213df9fac0b539nvd
- github.com/sparklemotion/nokogiri/commit/50f06b3efb638efb0abd95dc62dca05ae67882c2nvd
- github.com/sparklemotion/nokogiri/commit/7ffcd44d7e6c46704f8af0321d9314cd26e0e18anvd
- github.com/sparklemotion/nokogiri/commit/8598060bacada41a0eb09d95c97744ff4e428f8envd
- github.com/sparklemotion/nokogiri/commit/babe75030c7f64a37826bb3342317134568bef61nvd
- github.com/sparklemotion/nokogiri/commit/bf22713507fe1fc3a2c4b525cf0a88c2dc87a3a2nvd
- github.com/sparklemotion/nokogiri/security/advisories/GHSA-7rrm-v45f-jp64nvd
- www.vulncheck.com/advisories/nokogiri-before-multiple-vulnerabilities-via-libxml2nvd
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