8.7

CVE-2020-26237: debian debian_linux

CVSS: 8.7v3.1HighModified
AliasesUBUNTU-CVE-2020-26237DEBIAN-CVE-2020-26237DLA-2511-1
Published 24-11-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-26237 is a high (CVSS 8.7) vulnerability in debian debian_linux. EPSS estimates a 1.33% chance of exploitation in the next 30 days, higher than 70.7% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v3.1 (NVD)
EPSS score
1.33%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 24-11-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

1.33%

Chance of exploitation in the next 30 days

Percentile

71%

Versus all other CVEs

30-day change

+0.01 pp

From 1.32% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.33%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian2 products
  • highlight.js< 9.18.1+dfsg1-3 | < 8.2+ds-5+deb9u1
  • debian_linuxEOL9.0
Highlightjs1 product
  • highlight.js≥ 10.0.0, < 10.1.2 | < 9.18.2 | ≥ 10.1.0, < 10.1.2
Npm1 product
  • highlight.js< 9.18.2 | ≥ 10.0.0, < 10.1.2
Oracle1 product
Ubuntu1 product
  • highlight.js< 8.2+ds-4ubuntu0.1~esm1 | < 9.12.0+dfsg1-4ubuntu0.1~esm1 | < 9.12.0+dfsg1-5ubuntu0.1~esm1

5 vendors · 6 products

References

11 links
Show all 11 references