UBUNTU-CVE-2021-47996

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Source

https://ubuntu.com/security/CVE-2021-47996

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-47996.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-47996

Upstream

CVE-2021-47996

Published

2026-08-31T00:00:00Z

Modified

2026-08-31T22:15:08.372383054Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
8.7 (High) CVSS_V4 - 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 CVSS Calculator
Ubuntu - medium

Summary

[none]

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.

References

Affected packages

Ubuntu:16.04:LTS

ruby-nokogiri

Package

Name: ruby-nokogiri
Purl: pkg:deb/ubuntu/ruby-nokogiri?arch=source&distro=xenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.6.6.2+ds-2build2

1.6.6.3-1

1.6.7-1

1.6.7.1-1

1.6.7.2-3

1.6.7.2-3build1

1.6.7.2-3ubuntu0.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.6.7.2-3ubuntu0.1",
            "binary_name": "ruby-nokogiri"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-47996.json"

Ubuntu:18.04:LTS

ruby-nokogiri

Package

Name: ruby-nokogiri
Purl: pkg:deb/ubuntu/ruby-nokogiri?arch=source&distro=bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.8.0-1

1.8.1-1

1.8.1-1build1

1.8.2-1build1

1.8.2-1ubuntu0.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.8.2-1ubuntu0.1",
            "binary_name": "ruby-nokogiri"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-47996.json"

Ubuntu:24.04:LTS

ruby-nokogiri

Package

Name: ruby-nokogiri
Purl: pkg:deb/ubuntu/ruby-nokogiri?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.14.3+dfsg-2

1.16.2+dfsg-1

1.16.2+dfsg-1build1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.16.2+dfsg-1build1",
            "binary_name": "ruby-nokogiri"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-47996.json"

Ubuntu:26.04:LTS

ruby-nokogiri

Package

Name: ruby-nokogiri
Purl: pkg:deb/ubuntu/ruby-nokogiri?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.18.2+dfsg-1build1

1.18.10+dfsg-2

1.18.10+dfsg-3

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.18.10+dfsg-3",
            "binary_name": "ruby-nokogiri"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-47996.json"

Ubuntu:Pro:14.04:LTS

ruby-nokogiri

Package

Name: ruby-nokogiri
Purl: pkg:deb/ubuntu/ruby-nokogiri?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.5.9-2

1.5.9-3

1.6.0-1

1.6.1+ds-1

1.6.1+ds-1ubuntu0.1~esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.6.1+ds-1ubuntu0.1~esm1",
            "binary_name": "ruby-nokogiri"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-47996.json"

Ubuntu:Pro:20.04:LTS

ruby-nokogiri

Package

Name: ruby-nokogiri
Purl: pkg:deb/ubuntu/ruby-nokogiri?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.10.3+dfsg1-2

1.10.4+dfsg1-1

1.10.7+dfsg1-1

1.10.7+dfsg1-2

1.10.7+dfsg1-2build1

1.10.7+dfsg1-2ubuntu0.1~esm2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.10.7+dfsg1-2ubuntu0.1~esm2",
            "binary_name": "ruby-nokogiri"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-47996.json"

Ubuntu:Pro:22.04:LTS

ruby-nokogiri

Package

Name: ruby-nokogiri
Purl: pkg:deb/ubuntu/ruby-nokogiri?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.11.1+dfsg-2ubuntu1

1.11.7+dfsg-3

1.11.7+dfsg-3build1

1.13.1+dfsg-2

1.13.1+dfsg-2ubuntu0.1~esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.13.1+dfsg-2ubuntu0.1~esm1",
            "binary_name": "ruby-nokogiri"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-47996.json"