GHSA-63cw-57p8-fm3p
HIGHGHSA-63cw-57p8-fm3p is a high-severity (CVSS 8.8) Code Injection vulnerability in pytorch. O3 Security confirms whether GHSA-63cw-57p8-fm3p is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
PyTorch Vulnerable to Remote Code Execution via Untrusted Checkpoint Files
Blast Radius
pytorchReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
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:
- Heap memory corruption via
SETITEM/SETITEMSopcodes applied to non-dictionary types - 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
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | pytorch | all versions | 2.10.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pytorch. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update pytorch to 2.10.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-63cw-57p8-fm3p is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-63cw-57p8-fm3p is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-63cw-57p8-fm3p. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-63cw-57p8-fm3p in your dependencies?
O3 detects GHSA-63cw-57p8-fm3p across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.