MalwarePublished 6 Jul 2026Updated 1 Sep 2026

jsonupper (npm) · Malicious Code

Affects jsonupperSource GCVE Database

Malicious package : remove jsonupper and rotate any secrets on hosts that installed it.

Data as of 12 Sep 2026, 20:17 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-6841

What to do

Remove jsonupper from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Affected software

Product	Affected	Fixed in
npmjsonupper	Affected =1.0.0	Fixed in–

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Description

The npm package 'jsonupper' version 1.0.0 contains malicious code that compromises any computer on which it is installed or running. The compromise is severe enough that all secrets and keys stored on the affected system should be rotated immediately from a different, trusted machine. Removing the package alone may not fully eliminate the malicious presence, as the attacker may have established persistent control.

Impact

Complete system compromise on any machine running or having installed 'jsonupper' version 1.0.0. This includes potential unauthorized access to all stored secrets and keys, which must be considered compromised and rotated immediately. The attacker may maintain persistent access beyond the presence of the malicious package itself.

Defensive guidance

Remove the 'jsonupper' package version 1.0.0 immediately from all affected systems. Rotate all secrets and keys stored on compromised machines from a separate, secure computer. Due to the possibility of persistent compromise, consider rebuilding affected systems to ensure complete eradication of malicious code.

Summary

The 'jsonupper' npm package version 1.0.0 has been identified as containing malicious code. Installation or execution of this package results in a full compromise of the host system, potentially allowing an attacker to gain complete control. Due to the severity of the compromise, all sensitive credentials on the affected system must be rotated from a separate, secure environment. The package removal does not guarantee eradication of all malicious components introduced by the attacker.

References

github.com/advisories/GHSA-7g6j-h5h4-7wjx (opens in a new tab)

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What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Sep 2026, 20:17 UTC

Technical details

References

Community reviews