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GHSA-w37p-236h-pfx3
No affected components available
Security Advisory: Compromise of PyTorch Lightning PyPI Package Versions
Published: 2026-04-30
Last Updated: 2026-05-12
Github Advisory: CVE-2026-44484
We have identified a security incident affecting certain versions of one of our PyPI packages.
What happened
We have determined that one or more released versions of this package have been compromised and include malicious code.
Our current investigation indicates that the affected versions have introduced functionality consistent with a credential harvesting mechanism. We are still actively analysing the scope and behaviour of the code.
At this stage, the root cause of the compromise is still under investigation.
What versions are affected
We are currently working to confirm the exact set of impacted versions.
We have determined the following versions as affected and ask that you delete them from your systems:
2.6.22.6.3
We will update this advisory if the versions impacted by this vulnerability change.
What you should do immediately
If you have installed or are running any potentially affected versions:
- Assume the environment may be compromised
- Immediately rotate all credentials and secrets that may have been exposed, including:
- API keys
- Access tokens
- SSH keys
- Service account credentials
- Rebuild affected systems from a known clean state
- Pin PyTorch Lightning to version
2.6.1 - Review logs for any suspicious or unauthorised activity
Actions we have taken
- Quarantined malicious versions from PyPI
- Recommend using version
2.6.1: https://github.com/Lightning-AI/pytorch-lightning/releases/tag/2.6.1 - Revoked and rotated all internal credentials associated with our release process
- Initiated a full investigation into the compromise
Ongoing investigation
We are actively working to:
- Identify the exact mechanism of compromise
- Confirm the full set of affected versions
- Determine the behaviour and impact of the malicious code
- Assess any downstream impact to users
We will provide updates as soon as more information becomes available.
Commitment to transparency
We take the security of our users and the integrity of our software supply chain extremely seriously.
We will continue to share timely and accurate updates as our investigation progresses.
Contact
If you have questions or believe you may be impacted, please contact us at:
security@lightning.ai
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Active exploitation in the wild has been confirmed. Immediate patching or mitigation is required.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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