CVE-2020-26237

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Source
https://cve.org/CVERecord?id=CVE-2020-26237
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-26237.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2020-26237
Aliases
Downstream
Published
2020-11-24T23:15:11.223Z
Modified
2026-03-13T13:47:01.445929Z
Severity
  • 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
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

Git / github.com/highlightjs/highlight.js

Affected ranges

Type
GIT
Repo
https://github.com/highlightjs/highlight.js
Events
Introduced
74de6eaa1d4dddd2ce1b167abda91913a77c48e6
Fixed
edd73d2402b3d66706d141e9fadda004d237925d
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
d5f9137111f7b0a0796ce012082bcabf6dde89d6
Fixed
7241013ae011a585983e176ddc0489a7a52f6bb0
Database specific 
{
    "versions": [
        {
            "introduced": "10.1.0"
        },
        {
            "fixed": "10.1.2"
        },
        {
            "introduced": "0"
        },
        {
            "last_affected": "9.0"
        }
    ]
}

Affected versions

10.*
10.1.0

Database specific

unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "fixed": "9.18.2"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "8.0.30"
            }
        ]
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-26237.json"