CVE-2020-7743: The package mathjs before 7.5.1 are vulnerable to Prototype Pollution via the deepExtend function that runs up

This week

HIGH 7.3REMOTEUPGRADE

CVE-2020-7743 is a high-severity flaw (CVSS 7.3) affecting mathjs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The package mathjs before 7.5.1 are vulnerable to Prototype Pollution via the deepExtend function that runs upon configuration updates.

Why this priority

High severity
EPSS top 10%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.9% (top 10%)
CISA exploited list	No
Weakness	CWE-1321
Published	2020-10-13
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: mathjs

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-10-13 10:15 UTCPublished CVE record published
2026-06-17 03:25 UTCUpdated Record last modified

mathjs mathjs UPGRADE

Affected: < 7.5.1

Fixed in: 7.5.1

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls mathjs

2. UPGRADE to 7.5.1

npm install mathjs@">=7.5.1"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-7743?

mathjs: upgrade to 7.5.1. Exact commands for each OS are on this page.

Is CVE-2020-7743 being exploited?

CVE-2020-7743 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-7743 affect?

CVE-2020-7743 affects mathjs. Severity is high (CVSS 7.3). The package mathjs before 7.5.1 are vulnerable to Prototype Pollution via the deepExtend function that runs upon configuration updates.

How urgent is CVE-2020-7743?

Priority 58/100. High severity; EPSS top 10%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-41139 HIGH 8.8 UPGRADE Math.js is an extensive math library for JavaScript and Node.js
CVE-2026-40897 HIGH 8.8 UPGRADE Math.js is an extensive math library for JavaScript and Node.js
CVE-2017-1001003 CRITICAL 9.8 UPGRADE math.js before 3.17.0 had an issue where private properties such as a constructor could be replaced by using u

References

← Back to latest CVEs