PyTorch Vulnerable to Remote Code Execution via Untrusted Checkpoint Files

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.8 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

• CVE-2026-24747: 0.80% estimated exploitation activity in the next 30 days; percentile 56.59 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary A vulnerability in PyTorch's `weights_only` unpickler allows an attacker to craft a malicious checkpoint file (`.pth`) that, when loaded with `torch.load(..., weights_only=True)`, can corrupt memory and potentially lead to arbitrary code execution.

Vulnerability Details The `weights_only=True` unpickler failed to properly validate pickle opcodes and storage metadata, allowing: 1. Heap memory corruption via `SETITEM`/`SETITEMS` opcodes applied to non-dictionary types 2. Storage size mismatch between declared element count and actual data in the archive

Impact An attacker who can convince a user to load a malicious checkpoint file may achieve arbitrary code execution in the context of the victim's process.

Credit Ji'an Zhou

Published by the source

27 Jan 2026, 20:10 UTC

Last modified by the source

4 Nov 2026, 03:15 UTC

Source last checked

4 Nov 2026, 06:20 UTC

1. Revision 5 · amended · 4 Nov 2026

   Amended from osv record GHSA-63cw-57p8-fm3p

2. Revision 4 · amended · 4 Nov 2026

   Amended from ghsa record GHSA-63cw-57p8-fm3p

3. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-63cw-57p8-fm3p

4. Revision 2 · amended · 24 Oct 2026

   Amended from osv record PYSEC-2026-2286

5. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-63cw-57p8-fm3p

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# Patch Next advisory brief: CVE-2026-24747

Advisory: PyTorch Vulnerable to Remote Code Execution via Untrusted Checkpoint Files
IDs: CVE-2026-24747, GHSA-63cw-57p8-fm3p
Record: https://patchnext.com/advisories/cve-2026-24747 (revision 5, source checked 4 Nov 2026, 06:20 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: torch 2.10.0; pytorch 2.10.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI torch: affected < 2.10.0; fixed in 2.10.0
- PyPI pytorch: affected < 2.10.0; fixed in 2.10.0

## Suggested inspection (read-only)
- `python -m pip show torch`: prints the installed version. Run with the environment that serves production active.
- `python -m pip show pytorch`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on torch, pytorch.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-63cw-57p8-fm3p (OSV record GHSA-63cw-57p8-fm3p lists affected ranges: PyPI pytorch >=0 <2.10.0 (fixed))
- Verified: https://osv.dev/vulnerability/PYSEC-2026-2286 (OSV record PYSEC-2026-2286 lists affected ranges: PyPI torch >=0 <2.10.0 (fixed))
- Verified: https://github.com/advisories/GHSA-63cw-57p8-fm3p (GitHub-reviewed advisory GHSA-63cw-57p8-fm3p lists affected ranges: PyPI pytorch >=0 <2.10.0)
- Verified: https://github.com/advisories/GHSA-63cw-57p8-fm3p (GitHub-reviewed advisory GHSA-63cw-57p8-fm3p lists affected ranges: PyPI torch >=0 <2.10.0)
- Verified: https://osv.dev/vulnerability/GHSA-63cw-57p8-fm3p (OSV record GHSA-63cw-57p8-fm3p lists affected ranges: PyPI torch >=0 <2.10.0 (fixed))

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