CVE-2020-7743

Prototype Pollution

7.3 HighFix available

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

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: Low

Exploit likelihood

3.92%Up 2.5 points since Apr 14, 2021

What each source reports

CVE List Score used 7.3

Prototype Pollution

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

Record: CVE-2020-7743
CVSS 3.1: 7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated: 2026-11-02

EUVDEUVD-2021-1224 7.3

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

Record: EUVD-2021-1224
CVSS 3.1: 7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated: 2026-11-03

GitHub AdvisoriesGHSA-x2fc-mxcx-w4mf 7.3

Prototype Pollution in mathjs

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

Record: GHSA-x2fc-mxcx-w4mf
CVSS 3.1: 7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness: CWE-915
Updated: 2026-11-02

NVD 7.3

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

Record: CVE-2020-7743
CVSS 3.1: 7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-1321
Updated: 2026-11-02

OSV 7.3

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

Record: CVE-2020-7743
CVSS 3.1: 7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated: 2026-11-02

OSVGHSA-x2fc-mxcx-w4mf 7.3

Prototype Pollution in mathjs

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

Record: GHSA-x2fc-mxcx-w4mf
CVSS 3.1: 7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness: CWE-915
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`mathjs` npm	before 7.5.1	7.5.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, products, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-7743 is a high vulnerability (CVSS 7.3) in Josdejong Mathjs, published October 13, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.92%, the 90th percentile. Fixed in mathjs 7.5.1.

References

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