# CVE-2017-9462: Mercurial has Incorrect Permission Assignment for Critical Resource

Source: https://junglewise.ai/threats/cve-2017-9462-mercurial-has-incorrect-permission-assignment-for-critical  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2017-06-06  
License: CC BY 4.0 with a link back

CVE-2017-9462 · Severity: low · CVSS 3.1 · Published 2017-06-06

In Mercurial before 4.1.3, "hg serve --stdio" allows remote authenticated users to launch the Python debugger, and consequently execute arbitrary code, by using --debugger as a repository name.

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

## Quick answers

**Is CVE-2017-9462 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2017-9462 being exploited in the wild.

**How severe is CVE-2017-9462?** Low severity, with a CVSS score of 3.1, published 6 June 2017.

**Which products and versions are affected?** mercurial (PyPI) ECOSYSTEM:introduced=0,fixed=4.1.3.

**Is there a fix for CVE-2017-9462?** Yes. mercurial (PyPI): upgrade to 4.1.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2017-9462?** 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 4.1.3 or later

  ```sh
  pip install "mercurial>=4.1.3"
  ```


## Affected products

- mercurial (PyPI) ECOSYSTEM:introduced=0,fixed=4.1.3

## Identifiers

- CVE-2017-9462
- GHSA-ghjx-3jg5-h6r2
- PYSEC-2017-91

## Related threats

- [PYSEC-2026-666 - Mercurial Directory traversal vulnerability](https://junglewise.ai/threats/cve-2008-2942-mercurial-directory-traversal-vulnerability)
- [PYSEC-2026-665 - Mercurial Improper Certificate Validation vulnerability](https://junglewise.ai/threats/cve-2010-4237-mercurial-improper-certificate-validation-vulnerability)
- [JGit Improper Input Validation vulnerability](https://junglewise.ai/threats/cve-2014-9390-jgit-improper-input-validation-vulnerability)
- [Mercurial Path Traversal/Link Following vulnerability](https://junglewise.ai/threats/cve-2019-3902-mercurial-path-traversal-link-following-vulnerability)
- [PYSEC-2018-91 - cext/manifest.c in Mercurial before 4.7.2 has an out-of-bounds read during parsing of a malformed manifest entry.](https://junglewise.ai/threats/cve-2018-17983-mercurial-out-of-bounds-read-vulnerability)