# CVE-2025-30358: PYSEC-2026-1624 - Mesop Class Pollution vulnerability leads to DoS and Jailbreak attacks

Source: https://junglewise.ai/threats/cve-2025-30358-mesop-class-pollution-vulnerability-leads-to-dos-and-jailbreak  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-07  
License: CC BY 4.0 with a link back

CVE-2025-30358 · Severity: low · CVSS 3.1 · Published 2026-07-07

Mesop Class Pollution vulnerability leads to DoS and Jailbreak attacks

Technologies: [mesop (PyPI)](https://junglewise.ai/threats/technologies/mesop). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2025-30358 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-30358 being exploited in the wild.

**How severe is CVE-2025-30358?** Low severity, with a CVSS score of 3.1, published 7 July 2026.

**Which products and versions are affected?** mesop (PyPI) ECOSYSTEM:introduced=0,fixed=0.14.1.

**Is there a fix for CVE-2025-30358?** Yes. mesop (PyPI): upgrade to 0.14.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-30358?** Check whether you run mesop (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

- mesop (PyPI): upgrade to 0.14.1 or later

  ```sh
  pip install "mesop>=0.14.1"
  ```


## Affected products

- mesop (PyPI) ECOSYSTEM:introduced=0,fixed=0.14.1

## Identifiers

- CVE-2025-30358
- GHSA-f3mf-hm6v-jfhh
- PYSEC-2026-1624

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