CVE-2022-23631: superjson is a program to allow JavaScript expressions to be serialized to a superset of JSON

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CRITICAL 9.0REMOTEUPGRADEUPGRADE

CVE-2022-23631 is a critical-severity flaw (CVSS 9.0) affecting blitz, superjson. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

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, CWE-1321
Published	2022-02-09
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: blitzjs

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

Am I affected?

Timeline

2022-02-09 22:15 UTCPublished CVE record published
2026-06-17 04:30 UTCUpdated Record last modified

blitzjs blitz UPGRADE

Affected: < 0.45.3

Fixed in: 0.45.3

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls blitz

2. UPGRADE to 0.45.3

npm install blitz@">=0.45.3"

blitzjs superjson UPGRADE

Affected: < 1.8.1

Fixed in: 1.8.1

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls superjson

2. UPGRADE to 1.8.1

npm install superjson@">=1.8.1"

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-2022-23631?

blitz: upgrade to 0.45.3; superjson: upgrade to 1.8.1. Exact commands for each OS are on this page.

Is CVE-2022-23631 being exploited?

CVE-2022-23631 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-2022-23631 affect?

CVE-2022-23631 affects blitz, superjson. Severity is critical (CVSS 9.0). 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 knowl

How urgent is CVE-2022-23631?

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

Related CVEs

CVE-2025-60935 MEDIUM 6.1 DOWNGRADE An open redirect vulnerability in the login endpoint of Blitz Panel v1.17.0 allows attackers to redirect users

References

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