Security Digest · Vulnerability record
CVE-2026-44484: Compromise of PyTorch Lightning PyPi Package Versions
PyTorch Lightning is a deep learning framework to pretrain and finetune AI models.
CVSS 9.3 Critical EPSS 0.7% · p51
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.7%, percentile 51: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 51% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes
pytorch-lightning(PyPI) = 2.6.2, no fixed version listed;pytorch-lightning(PyPI) = 2.6.3, no fixed version listed. Check your lockfile, including transitive dependencies.
What it is
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.
From the GitHub advisory
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
Weakness type: CWE-506, CWE-829.
Product: pytorch-lightning (PyPI) · Assigned by: GitHub_M · Published: 2026-05-14
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| PyPI | pytorch-lightning | = 2.6.2 | none listed |
| PyPI | pytorch-lightning | = 2.6.3 | none listed |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Lightning-AI | pytorch-lightning | 2.6.2, 2.6.3 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_M | 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 |
| redhat-SADP | 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 4.0 | 9.3 | 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 |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Attack requirements: none
- Privileges required: none (no login)
- User interaction: none
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none, automatable yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 0.67% probability of exploitation activity in the next 30 days; percentile 51.
Timeline
- — GitHub-reviewed advisory GHSA-w37p-236h-pfx3 published (critical)
- — CVE record published by GitHub_M
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-w37p-236h-pfx3 github.com
- CVE.org record CVE-2026-44484 cve.org
- NVD entry CVE-2026-44484 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com
- access.redhat.com access.redhat.com
- RHBZ#2477476 bugzilla.redhat.com
- security.access.redhat.com security.access.redhat.com