MalwarePublished 29 Oct 2025

jsx-a11y (npm) · Malicious Code

Affects jsx-a11ySource GCVE Database

Malicious package : remove jsx-a11y and rotate any secrets on hosts that installed it.

Data as of 29 Oct 2026, 23:04 UTC

Classification

Malicious package

Published to npm · OSV MAL-2025-49016

What to do

Remove jsx-a11y 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
npmjsx-a11y	Affected =5.9.0	Fixed in–

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Description

The jsx-a11y npm package version 5.9.0 contains malicious code that installs a dependency from a custom domain which runs an information stealer during installation. This malware targets npm, git, and CI/CD tokens, potentially compromising all secrets and keys on the infected computer. Removal of the package does not guarantee complete eradication of the malicious software, and immediate rotation of all secrets from a different machine is strongly advised.

Impact

Systems with jsx-a11y version 5.9.0 installed are fully compromised due to the installation of a malicious dependency that steals sensitive tokens used for npm, git, and CI/CD operations. This can lead to unauthorized access to repositories, deployment pipelines, and other critical infrastructure components. The attacker may have persistent control beyond the presence of the package itself.

Defensive guidance

Remove the jsx-a11y package version 5.9.0 immediately. Rotate all secrets, tokens, and keys that were stored or used on the compromised system from a separate, secure computer. Because full system compromise is likely, consider rebuilding or thoroughly cleaning the affected environment to ensure removal of all malicious components.

Summary

The jsx-a11y package version 5.9.0 was found to include malicious code that installs a dependency hosted on a custom domain. This dependency executes an info stealer during installation, focusing on stealing sensitive tokens related to npm, git, and CI/CD environments. Any system with this package installed should be considered fully compromised, as the attacker may have gained full control. The malicious package compromises secrets and keys stored on the system, necessitating immediate rotation of all credentials from a secure, unaffected device. Removal of the package alone is insufficient to ensure system integrity.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Oct 2026, 23:04 UTC

Technical details

References

Community reviews