Affected: MervinPraison PraisonAI

PraisonAI is a multi-agent teams system. Prior to 4.5.128, the _safe_extractall() function in PraisonAI's recipe registry validates archive members against path traversal attacks but performs no checks on individual member sizes, cumulative extracted size, or member count before calling tar.extractall(). An attacker can publish a malicious recipe bundle containing highly compressible data (e.g., 10GB of zeros compressing to ~10MB) that exhausts the victim's disk when pulled via LocalRegistry.pull() or HttpRegistry.pull(). This vulnerability is fixed in 4.5.128.

Affected: PyPI: PraisonAI

## Summary

The `_safe_extractall()` function in PraisonAI's recipe registry validates archive members against path traversal attacks but performs no checks on individual member sizes, cumulative extracted size, or member count before calling `tar.extractall()`. An attacker can publish a malicious recipe bundle containing highly compressible data (e.g., 10GB of zeros compressing to ~10MB) that exhausts the victim's disk when pulled via `LocalRegistry.pull()` or `HttpRegistry.pull()`.

## Details

The vulnerable function is `_safe_extractall()` at `src/praisonai/praisonai/recipe/registry.py:131-162`:

```python def _safe_extractall(tar: tarfile.TarFile, dest_dir: Path) -> None: dest_resolved = dest_dir.resolve() for member in tar.getmembers(): member_path = Path(member.name) # Reject absolute paths if member_path.is_absolute(): raise RegistryError(...) # Reject '..' components if '..' in member_path.parts: raise RegistryError(...) # Reject resolved paths escaping dest_dir resolved = (dest_resolved / member_path).resolve() if not str(resolved).startswith(str(dest_resolved) + os.sep) and resolved != dest_resolved: raise RegistryError(...) # All members validated — safe to extract tar.extractall(dest_dir) # <-- No size limit ```

The function iterates all tar members and checks for path traversal (absolute paths, `..` components, resolved path escaping), but never…