---
title: "CVE-2026-44484: Compromise of PyTorch Lightning PyPi Package Versions"
url: https://erroneo.us/security/cve/CVE-2026-44484/
description: "CVE-2026-44484 (pytorch-lightning (PyPI)): PyTorch Lightning is a deep learning framework to pretrain and finetune AI models. Versions 2.6.2 and 2.6.2 have…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-14
date_modified: 2026-07-15
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-44484"
kev: false
cvss: 9.3
epss: 0.00671
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-44484: Compromise of PyTorch Lightning PyPi Package Versions

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- 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.

## Affected packages

- PyPI `pytorch-lightning` = 2.6.2 → fixed: none listed
- PyPI `pytorch-lightning` = 2.6.3 → fixed: none listed

## Affected products (CVE record)

- Lightning-AI pytorch-lightning: 2.6.2, 2.6.3

## Severity

- GitHub_M CVSS 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`
- redhat-SADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 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`

## Exploitation

- 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.

## Sources

- [GitHub Advisory GHSA-w37p-236h-pfx3](https://github.com/advisories/GHSA-w37p-236h-pfx3)
- [CVE.org record CVE-2026-44484](https://www.cve.org/CVERecord?id=CVE-2026-44484)
- [NVD entry CVE-2026-44484](https://nvd.nist.gov/vuln/detail/CVE-2026-44484)
- [github.com](https://github.com/Lightning-AI/pytorch-lightning/security/advisories/GHSA-w37p-236h-pfx3)
- [access.redhat.com](https://access.redhat.com/security/cve/CVE-2026-44484)
- [RHBZ#2477476](https://bugzilla.redhat.com/show_bug.cgi?id=2477476)
- [security.access.redhat.com](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44484.json)

---
Source page: https://erroneo.us/security/cve/CVE-2026-44484/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt