CVE-2022-21122: The package metacalc before 0.0.2 are vulnerable to Arbitrary Code Execution when it exposes JavaScript's Math

Q: How do I fix CVE-2022-21122?

metacalc: upgrade to 0.0.2. Exact commands for each OS are on this page.

Q: Is CVE-2022-21122 being exploited?

CVE-2022-21122 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-2022-21122 affect?

CVE-2022-21122 affects metacalc. Severity is critical (CVSS 9.0). The package metacalc before 0.0.2 are vulnerable to Arbitrary Code Execution when it exposes JavaScript's Math class to the v8 context. As the Math class is exposed to user-land, it can be used to get access to JavaScript's Function constru

Q: How urgent is CVE-2022-21122?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.0REMOTEUPGRADE

CVE-2022-21122 is a critical-severity flaw (CVSS 9.0) affecting metacalc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The package metacalc before 0.0.2 are vulnerable to Arbitrary Code Execution when it exposes JavaScript's Math class to the v8 context. As the Math class is exposed to user-land, it can be used to get access to JavaScript's Function constructor.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.0 (Critical)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Weakness	CWE-94
Published	2022-06-08
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: metarhia

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

Am I affected?

Timeline

2022-06-08 09:15 UTCPublished CVE record published
2026-06-17 04:25 UTCUpdated Record last modified

metarhia metacalc UPGRADE

Affected: < 0.0.2

Fixed in: 0.0.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy metacalc || rpm -q metacalc || metacalc --version

2. UPGRADE to 0.0.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade metacalc

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade metacalc

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2022-21122?

metacalc: upgrade to 0.0.2. Exact commands for each OS are on this page.

Is CVE-2022-21122 being exploited?

CVE-2022-21122 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-2022-21122 affect?

CVE-2022-21122 affects metacalc. Severity is critical (CVSS 9.0). The package metacalc before 0.0.2 are vulnerable to Arbitrary Code Execution when it exposes JavaScript's Math class to the v8 context. As the Math class is exposed to user-land, it can be used to get access to JavaScript's Function constru

How urgent is CVE-2022-21122?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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