CVE-2026-44484
Compromise of PyTorch Lightning PyPi Package Versions
PyTorch Lightning is a deep learning framework to pretrain and finetune AI models. Versions 2.6.2 and 2.6.2 have introduced functionality consistent with a credential harvesting mechanism.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Compromise of PyTorch Lightning PyPi Package Versions
PyTorch Lightning is a deep learning framework to pretrain and finetune AI models. Versions 2.6.2 and 2.6.2 have introduced functionality consistent with a credential harvesting mechanism.
- Record
CVE-2026-44484- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-506, CWE-829
- Updated
- 2026-11-02
EUVDEUVD-2026-30303
PyTorch Lightning is a deep learning framework to pretrain and finetune AI models. Versions 2.6.2 and 2.6.2 have introduced functionality consistent with a credential harvesting mechanism.
- Record
EUVD-2026-30303- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-w37p-236h-pfx3
Compromise of PyTorch Lightning PyPi Package Versions
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:
- Record
GHSA-w37p-236h-pfx3- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-506
- Updated
- 2026-11-02
NVD
PyTorch Lightning is a deep learning framework to pretrain and finetune AI models. Versions 2.6.2 and 2.6.2 have introduced functionality consistent with a credential harvesting mechanism.
- Record
CVE-2026-44484- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-506, CWE-829
- Updated
- 2026-11-02
OSVGHSA-w37p-236h-pfx3
Compromise of PyTorch Lightning PyPi Package Versions
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:
- Record
GHSA-w37p-236h-pfx3- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-506
- Updated
- 2026-11-02
OSVPYSEC-2026-3973
Compromise of PyTorch Lightning PyPi Package Versions
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:
- Record
PYSEC-2026-3973- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVPYSEC-2026-508
Compromise of PyTorch Lightning PyPi Package Versions
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:
- Record
PYSEC-2026-508- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
pytorch-lightningPyPI |
2.6.2 to 2.6.2 | None known |
pytorch-lightningPyPI |
2.6.3 to 2.6.3 | None known |
pytorch-lightningPyPI |
Listed versions 2.6.2 |
None known |
pytorch-lightningPyPI |
Listed versions 2.6.3 |
None known |
lightningPyPI |
2.6.2 up to 2.6.4, plus listed versions 2.6.3 |
2.6.4 |
pytorch-lightningPyPI |
2.6.2 up to 2.6.4, plus listed versions 2.6.3 |
2.6.4 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-44484 is a critical vulnerability (CVSS 9.3) in Lightningai Pytorch Lightning, published May 7, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.39%, the 33rd percentile. Fixed in lightning 2.6.4.
References
github.com/Lightning-AI/pytorch-lightning/security/advisories/GHSA-w37p-236h-pfx3
access.redhat.com/security/cve/CVE-2026-44484
bugzilla.redhat.com/show_bug.cgi?id=2477476
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44484.json
nvd.nist.gov/vuln/detail/CVE-2026-44484
pypi.org/project/pytorch-lightning