CVE-2020-7608: yargs-parser could be tricked into adding or modifying properties of Object.prototype using a "proto" payl

Q: How do I fix CVE-2020-7608?

yargs-parser: upgrade to 5.0.1, 13.1.2, 15.0.1, 18.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2020-7608 being exploited?

CVE-2020-7608 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-7608 affect?

CVE-2020-7608 affects yargs-parser. Severity is medium (CVSS 5.3). yargs-parser could be tricked into adding or modifying properties of Object.prototype using a "__proto__" payload.

Q: How urgent is CVE-2020-7608?

Priority 35/100. Public exploit reference

Routine

MEDIUM 5.3UPGRADE

CVE-2020-7608 is a medium-severity flaw (CVSS 5.3) affecting yargs-parser. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

yargs-parser could be tricked into adding or modifying properties of Object.prototype using a "__proto__" payload.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-1321
Published	2020-03-16
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: yargs

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

Am I affected?

Timeline

2020-03-16 20:15 UTCPublished CVE record published
2026-06-17 03:25 UTCUpdated Record last modified

yargs yargs-parser UPGRADE

Affected: < 5.0.1 · >= 6.0.0 and < 13.1.2 · >= 14.0.0 and < 15.0.1 · >= 16.0.0 and < 18.1.1

Fixed in: 5.0.1, 13.1.2, 15.0.1, 18.1.1

Safe to downgrade to: a release before 6.0.0

1. Check installed version

npm ls yargs-parser

2. UPGRADE to 5.0.1

npm install yargs-parser@">=5.0.1"

3. If no update is available yet, DOWNGRADE to a release before 6.0.0

npm view yargs-parser versions npm install yargs-parser@"<6.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2020-7608?