CVE-2026-44484: PyTorch Lightning is a deep learning framework to pretrain and finetune AI models

Q: How do I fix CVE-2026-44484?

pytorch lightning: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2026-44484 being exploited?

CVE-2026-44484 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-44484 affect?

CVE-2026-44484 affects pytorch lightning. Severity is critical (CVSS 9.8). 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.

Q: How urgent is CVE-2026-44484?

Priority 48/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2026-44484 is a critical-severity flaw (CVSS 9.8) affecting pytorch lightning. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-506, CWE-829
Published	2026-05-14
Last modified	2026-07-15

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

Last updated 2026-07-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-14 15:16 UTCPublished CVE record published
2026-07-15 02:21 UTCUpdated Record last modified

lightningai pytorch lightning DOWNGRADE

Affected: 2.6.2 · 2.6.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.6.2

1. Check installed version

pip show pytorch-lightning

2. No fixed release: DOWNGRADE to a release before 2.6.2

pip index versions pytorch-lightning pip install "pytorch-lightning<2.6.2"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-44484?

pytorch lightning: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-44484 being exploited?

CVE-2026-44484 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-2026-44484 affect?

CVE-2026-44484 affects pytorch lightning. Severity is critical (CVSS 9.8). 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.

How urgent is CVE-2026-44484?

Priority 48/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

PyTorch vulnerabilities

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References

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