---
id: CVE-2021-47996
title: 'Rejected reason: This CVE ID has been rejected as a duplicate.'
summary: 'Rejected reason: This CVE ID has been rejected as a duplicate.'
severity: high
published: '2026-08-25'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T15:17:33.597'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-47996'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.00502
epssPercentile: 0.41186
ingestedAt: '2026-09-08T15:33:26.955Z'
vendor: Red Hat
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-125
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47996.json
  - url: 'https://access.redhat.com/security/cve/CVE-2021-47996'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2523549'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2021-47996'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2021-47996'
  - url: >-
      https://github.com/sparklemotion/nokogiri/commit/0e1a49c8907645d2e155f0d89d4d9895ac5112b5
  - url: >-
      https://github.com/sparklemotion/nokogiri/commit/1098c30a040e72a4654968547f415be4e4c40fe7
  - url: >-
      https://github.com/sparklemotion/nokogiri/commit/1358d157d0bd83be1dfe356a69213df9fac0b539
  - url: >-
      https://github.com/sparklemotion/nokogiri/commit/50f06b3efb638efb0abd95dc62dca05ae67882c2
  - url: >-
      https://github.com/sparklemotion/nokogiri/commit/7ffcd44d7e6c46704f8af0321d9314cd26e0e18a
  - url: >-
      https://github.com/sparklemotion/nokogiri/commit/8598060bacada41a0eb09d95c97744ff4e428f8e
  - url: >-
      https://github.com/sparklemotion/nokogiri/commit/babe75030c7f64a37826bb3342317134568bef61
  - url: >-
      https://github.com/sparklemotion/nokogiri/commit/bf22713507fe1fc3a2c4b525cf0a88c2dc87a3a2
  - url: >-
      https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-7rrm-v45f-jp64
  - url: >-
      https://www.vulncheck.com/advisories/nokogiri-before-multiple-vulnerabilities-via-libxml2
---

## Overview

Rejected reason: This CVE ID has been rejected as a duplicate.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · updated 2026-09-08 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47996.json)