CVE-2020-26237
CVSS V2 Medium 4.9
CVSS V3 High 8.7
Description
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.
Overview
- CVE ID
- CVE-2020-26237
- Assigner
- security-advisories@github.com
- Vulnerability Status
- Analyzed
- Published Version
- 2020-11-24T23:15:11
- Last Modified Date
- 2022-10-19T13:49:21
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:highlightjs:highlight.js:*:*:*:*:*:node.js:*:* | 1 | OR | 9.18.2 | |
| cpe:2.3:a:highlightjs:highlight.js:*:*:*:*:*:node.js:*:* | 1 | OR | 10.1.0 | 10.1.2 |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:a:oracle:mysql_enterprise_monitor:*:*:*:*:*:*:*:* | 1 | OR | 8.0.30 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:M/Au:S/C:N/I:P/A:P
- Access Vector
- NETWORK
- Access Compatibility
- MEDIUM
- Authentication
- SINGLE
- Confidentiality Impact
- NONE
- Integrity Impact
- PARTIAL
- Availability Impact
- PARTIAL
- Base Score
- 4.9
- Severity
- MEDIUM
- Exploitability Score
- 6.8
- Impact Score
- 4.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- LOW
- User Interaction
- REQUIRED
- Scope
- CHANGED
- Confidentiality Impact
- NONE
- Availability Impact
- HIGH
- Base Score
- 8.7
- Base Severity
- HIGH
- Exploitability Score
- 2.3
- Impact Score
- 5.8
References
| Reference URL | Reference Tags |
|---|---|
| https://github.com/highlightjs/highlight.js/commit/7241013ae011a585983e176ddc0489a7a52f6bb0 | Patch Third Party Advisory |
| https://github.com/highlightjs/highlight.js/pull/2636 | Patch Third Party Advisory |
| https://github.com/highlightjs/highlight.js/security/advisories/GHSA-vfrc-7r7c-w9mx | Mitigation Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2020/12/msg00041.html | Mailing List Third Party Advisory |
| https://www.npmjs.com/package/highlight.js | Third Party Advisory |
| https://www.oracle.com/security-alerts/cpujul2022.html | Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2020-26237 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26237 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 07:29:03 | Added to TrackCVE | |||
| 2022-12-05 17:18:46 | 2020-11-24T23:15Z | 2020-11-24T23:15:11 | CVE Published Date | updated |
| 2022-12-05 17:18:46 | 2022-10-19T13:49:21 | CVE Modified Date | updated | |
| 2022-12-05 17:18:46 | Analyzed | Vulnerability Status | updated | |
| 2022-12-05 17:18:50 | References | updated |