CVE-2022-23631

Name: CVE-2022-23631
Creator: NVD / NIST
Published: 2022-02-09T22:15:07.663+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.31%

Last modified Jun 17, 2026

CVE-2022-23631 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. superjson is a program to allow JavaScript expressions to be serialized to a superset of JSON. In versions prior to 1.8.1 superjson allows input to run arbitrary code on any server using superjson input without prior authentication or knowledge. EPSS estimates a 2.31% chance of exploitation in the next 30 days.

Description

superjson is a program to allow JavaScript expressions to be serialized to a superset of JSON. In versions prior to 1.8.1 superjson allows input to run arbitrary code on any server using superjson input without prior authentication or knowledge. The only requirement is that the server implements at least one endpoint which uses superjson during request processing. This has been patched in superjson 1.8.1. Users are advised to update. There are no known workarounds for this issue.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.31%

81.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Blitzjs	Blitz	< 0.45.3
Blitzjs	Superjson	< 1.8.1

References

https://github.com/advisories/GHSA-5888-ffcr-r425Exploit, Third Party Advisory
https://github.com/blitz-js/superjson/security/advisories/GHSA-5888-ffcr-r425Exploit, Third Party Advisory
https://www.sonarsource.com/blog/blitzjs-prototype-pollution/Exploit, Third Party Advisory
https://github.com/advisories/GHSA-5888-ffcr-r425Exploit, Third Party Advisory
https://github.com/blitz-js/superjson/security/advisories/GHSA-5888-ffcr-r425Exploit, Third Party Advisory
https://www.sonarsource.com/blog/blitzjs-prototype-pollution/Exploit, Third Party Advisory

Timeline

Published: Feb 9, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-23631?

How severe is CVE-2022-23631?

CVE-2022-23631 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.31% probability of exploitation in the next 30 days.

How do I fix CVE-2022-23631?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-23631?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST