CVE-2017-16876: mistune Cross-site scripting (XSS) vulnerability

CVE-2017-16876 · Severity: low · CVSS 3.1 · Published 2017-12-29

Cross-site scripting (XSS) vulnerability in the _keyify function in mistune.py in Mistune before 0.8.1 allows remote attackers to inject arbitrary web script or HTML by leveraging failure to escape the "key" argument.

Technologies: mistune (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2017-16876 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2017-16876 being exploited in the wild.
How severe is CVE-2017-16876?
Low severity, with a CVSS score of 3.1, published 29 December 2017.
Which products and versions are affected?
mistune (PyPI) ECOSYSTEM:introduced=0,fixed=0.8.1, GIT:introduced=0,fixed=5f06d724bc05580e7f203db2d4a4905fc1127f98|ECOSYSTEM:introduced=0,fixed=0.8.1.
Is there a fix for CVE-2017-16876?
Yes. mistune (PyPI): upgrade to 0.8.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2017-16876?
Check whether you run mistune (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

  • mistune (PyPI): upgrade to 0.8.1 or later
    pip install "mistune>=0.8.1"

Affected products

  • mistune (PyPI) ECOSYSTEM:introduced=0,fixed=0.8.1, GIT:introduced=0,fixed=5f06d724bc05580e7f203db2d4a4905fc1127f98|ECOSYSTEM:introduced=0,fixed=0.8.1

Identifiers

  • CVE-2017-16876
  • GHSA-98gj-wwxm-cj3h
  • PYSEC-2017-18

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.