CVE-2019-3902: Mercurial Path Traversal/Link Following vulnerability

CVE-2019-3902 · Severity: low · CVSS 3 · Published 2019-04-22

A flaw was found in Mercurial before 4.9. It was possible to use symlinks and subrepositories to defeat Mercurial's path-checking logic and write files outside a repository.

Technologies: mercurial (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2019-3902 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2019-3902 being exploited in the wild.
How severe is CVE-2019-3902?
Low severity, with a CVSS score of 3, published 22 April 2019.
Which products and versions are affected?
mercurial (PyPI) ECOSYSTEM:introduced=0,fixed=4.9.
Is there a fix for CVE-2019-3902?
Yes. mercurial (PyPI): upgrade to 4.9 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2019-3902?
Check whether you run mercurial (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

  • mercurial (PyPI): upgrade to 4.9 or later
    pip install "mercurial>=4.9"

Affected products

  • mercurial (PyPI) ECOSYSTEM:introduced=0,fixed=4.9

Identifiers

  • CVE-2019-3902
  • GHSA-mq66-vcfc-8246
  • PYSEC-2019-188

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