UBUNTU-CVE-2020-26237

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Source
https://ubuntu.com/security/CVE-2020-26237
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-26237.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2020-26237
Upstream
Published
2020-11-24T23:15:00Z
Modified
2026-01-20T17:06:12.628422Z
Severity
  • 5.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:N CVSS Calculator
  • 8.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Highlight.js is a syntax highlighter written in JavaScript. Highlight.js versions before 9.18.2 and 10.1.2 are vulnerable to Prototype Pollution. A malicious HTML code block can be crafted that will result in prototype pollution of the base object's prototype during highlighting. If you allow users to insert custom HTML code blocks into your page/app via parsing Markdown code blocks (or similar) and do not filter the language names the user can provide you may be vulnerable. The pollution should just be harmless data but this can cause problems for applications not expecting these properties to exist and can result in strange behavior or application crashes, i.e. a potential DOS vector. If your website or application does not render user provided data it should be unaffected. Versions 9.18.2 and 10.1.2 and newer include fixes for this vulnerability. If you are using version 7 or 8 you are encouraged to upgrade to a newer release.

References

Affected packages

Ubuntu:16.04:LTS
highlight.js

Package

Name
highlight.js
Purl
pkg:deb/ubuntu/highlight.js@8.2+ds-4build1?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

8.*
8.2+ds-4build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjs-highlight",
            "binary_version": "8.2+ds-4build1"
        },
        {
            "binary_name": "libjs-highlight.js",
            "binary_version": "8.2+ds-4build1"
        },
        {
            "binary_name": "node-highlight",
            "binary_version": "8.2+ds-4build1"
        },
        {
            "binary_name": "node-highlight.js",
            "binary_version": "8.2+ds-4build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-26237.json"
Ubuntu:18.04:LTS
highlight.js

Package

Name
highlight.js
Purl
pkg:deb/ubuntu/highlight.js@9.12.0+dfsg1-4?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.12.0+dfsg1-3
9.12.0+dfsg1-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjs-highlight",
            "binary_version": "9.12.0+dfsg1-4"
        },
        {
            "binary_name": "libjs-highlight.js",
            "binary_version": "9.12.0+dfsg1-4"
        },
        {
            "binary_name": "node-highlight",
            "binary_version": "9.12.0+dfsg1-4"
        },
        {
            "binary_name": "node-highlight.js",
            "binary_version": "9.12.0+dfsg1-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-26237.json"
Ubuntu:20.04:LTS
highlight.js

Package

Name
highlight.js
Purl
pkg:deb/ubuntu/highlight.js@9.12.0+dfsg1-5?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.12.0+dfsg1-4ubuntu1
9.12.0+dfsg1-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjs-highlight",
            "binary_version": "9.12.0+dfsg1-5"
        },
        {
            "binary_name": "libjs-highlight.js",
            "binary_version": "9.12.0+dfsg1-5"
        },
        {
            "binary_name": "node-highlight",
            "binary_version": "9.12.0+dfsg1-5"
        },
        {
            "binary_name": "node-highlight.js",
            "binary_version": "9.12.0+dfsg1-5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-26237.json"
Ubuntu:22.04:LTS
highlight.js

Package

Name
highlight.js
Purl
pkg:deb/ubuntu/highlight.js@9.18.5+dfsg1-1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.18.5+dfsg1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjs-highlight.js",
            "binary_version": "9.18.5+dfsg1-1"
        },
        {
            "binary_name": "node-highlight.js",
            "binary_version": "9.18.5+dfsg1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-26237.json"
Ubuntu:24.04:LTS
highlight.js

Package

Name
highlight.js
Purl
pkg:deb/ubuntu/highlight.js@9.18.5+dfsg1-2?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.18.5+dfsg1-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjs-highlight.js",
            "binary_version": "9.18.5+dfsg1-2"
        },
        {
            "binary_name": "node-highlight.js",
            "binary_version": "9.18.5+dfsg1-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-26237.json"
Ubuntu:25.10
highlight.js

Package

Name
highlight.js
Purl
pkg:deb/ubuntu/highlight.js@9.18.5+dfsg1-2?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.18.5+dfsg1-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjs-highlight.js",
            "binary_version": "9.18.5+dfsg1-2"
        },
        {
            "binary_name": "node-highlight.js",
            "binary_version": "9.18.5+dfsg1-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-26237.json"