CVE-2025-3121 PyTorch torch.jit.jit_module_from_flatbuffer memory corruption
Local attackers can exploit memory corruption in PyTorch's JIT module loading to potentially execute code or cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-3121?
CVE-2025-3121 is a medium-severity memory corruption vulnerability in PyTorch, published on 2 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability classified as problematic has been found in PyTorch 2.6.0. Affected is the function torch.jit.jit_module_from_flatbuffer. The manipulation leads to memory corruption. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used.
Weakness: CWE-119
Which versions are affected by CVE-2025-3121?
2 open source packages ship an affected version, including pytorch and torch. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
pytorch Bitnami | From 2.6.0 | 2.7.0 |
torch PyPI | All versions to 2.6.0-NA | None |
Products include Linuxfoundation Pytorch.
How do I fix CVE-2025-3121?
Upgrade pytorch to 2.7.0 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-3121 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-3121 exists.
Other vulnerabilities in PyTorch
- CVE-2024-48063 Deserialization in n/a
- CVE-2022-45907 PyTorch vulnerable to arbitrary code execution
- CVE-2025-32434 PyTorch: `torch.load` with `weights_only=True` leads to remote code execution
- CVE-2026-24747 PyTorch Vulnerable to Remote Code Execution via Untrusted Checkpoint Files
- CVE-2024-31583 Pytorch use-after-free vulnerability
Sources
Also known as BIT-pytorch-2025-3121, DEBIAN-CVE-2025-3121, ECHO-c621-89db-7a9f, GHSA-qcc7-ch57-rh8j, PYSEC-2025-196, UBUNTU-CVE-2025-3121.