CVE-2025-4287: PyTorch nccl.py torch.cuda.nccl.reduce denial of service

Severity: low (CVSS 3.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-05 · updated 2026-06-17
Weakness: CWE-404

Description

A vulnerability was found in PyTorch 2.6.0+cu124. It has been rated as problematic. Affected by this issue is the function torch.cuda.nccl.reduce of the file torch/cuda/nccl.py. The manipulation leads to denial of service. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used. The patch is identified as 5827d2061dcb4acd05ac5f8e65d8693a481ba0f5. It is recommended to apply a patch to fix this issue.

Affected products

PyTorch: 2.6.0+cu124

References

https://github.com/Divigroup-RAP/PYTORCH/commit/5827d2061dcb4acd05ac5f8e65d8693a481ba0f5
https://github.com/pytorch/pytorch/issues/150836
https://github.com/pytorch/pytorch/issues/150836#issue-2979097872
https://github.com/pytorch/pytorch/pull/150923
https://vuldb.com/?ctiid.307394
https://vuldb.com/?id.307394
https://vuldb.com/?submit.553644

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