# CVE-2026-40148: PraisonAI decompression bomb in recipe registry extraction

Source: https://junglewise.ai/threats/cve-2026-40148-praisonai-decompression-bomb-in-recipe-registry-extraction  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-09. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2026-40148 · Severity: medium · CVSS 6.5 · Published 2026-04-09

PraisonAI, a framework for managing AI agents and recipes, is vulnerable to a 'decompression bomb' attack. An attacker can create a specially crafted recipe file that appears small but expands to a massive size when opened, potentially filling up a user's hard drive. This can cause the system to crash or stop working correctly, leading to a denial of service.

Technologies: [Praisonai](https://junglewise.ai/threats/technologies/praisonai), [praisonai (PyPI)](https://junglewise.ai/threats/technologies/pypi-praisonai). Vendors: [Praison](https://junglewise.ai/threats/vendors/praison), [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2026-40148 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-40148 being exploited in the wild.

**How severe is CVE-2026-40148?** Medium severity, with a CVSS score of 6.5, published 9 April 2026.

**Which products and versions are affected?** praisonai (PyPI) ECOSYSTEM:introduced=0,fixed=4.5.128.

**Is there a fix for CVE-2026-40148?** Yes. praisonai (PyPI): upgrade to 4.5.128 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-40148 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-40148?** Check whether you run Praisonai or praisonai (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- praisonai (PyPI): upgrade to 4.5.128 or later

  ```sh
  pip install "praisonai>=4.5.128"
  ```


## Technical details

The `_safe_extractall()` function in `src/praisonai/praisonai/recipe/registry.py` fails to validate the uncompressed size or member count of tar archives before extraction. While the function implements path traversal protections, it does not inspect the `size` attribute of `TarInfo` objects. An attacker can provide a malicious recipe bundle via `LocalRegistry.pull()` or `HttpRegistry.pull()` that contains highly compressed data (e.g., 10GB of zeros compressed to 10MB). When a user pulls this recipe, the extraction process exhausts available disk space. This vulnerability is classified as CWE-409 and is fixed in version 4.5.128.

## Affected products

- MervinPraison PraisonAI < 4.5.128

## Identifiers

- CVE-2026-40148
- GHSA-f2h6-7xfr-xm8w
- PYSEC-2026-2912

## Timeline

- 2026-04-09: disclosed
- 2026-04-09: patched: Fixed in version 4.5.128
- 2026-04-10: advisory

## References

- [https://api.github.com/users/offset](https://api.github.com/users/offset)
- [https://github.com/offset](https://github.com/offset)
- [https://api.github.com/users/offset/gists%7B/gist_id%7D](https://api.github.com/users/offset/gists%7B/gist_id%7D)
- [https://api.github.com/users/offset/repos](https://api.github.com/users/offset/repos)
- [https://avatars.githubusercontent.com/u/114768995?v=4](https://avatars.githubusercontent.com/u/114768995?v=4)
- [https://api.github.com/users/offset/events%7B/privacy%7D](https://api.github.com/users/offset/events%7B/privacy%7D)

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