# CVE-2018-13348: Mercurial Improper Input Validation vulnerability

Source: https://junglewise.ai/threats/cve-2018-13348-mercurial-improper-input-validation-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2018-07-06  
License: CC BY 4.0 with a link back

CVE-2018-13348 · Severity: low · CVSS 3 · Published 2018-07-06

The mpatch_decode function in mpatch.c in Mercurial before 4.6.1 mishandles certain situations where there should be at least 12 bytes remaining after the current position in the patch data, but actually are not, aka OVE-20180430-0001.

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

## Quick answers

**Is CVE-2018-13348 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2018-13348 being exploited in the wild.

**How severe is CVE-2018-13348?** Low severity, with a CVSS score of 3, published 6 July 2018.

**Which products and versions are affected?** mercurial (PyPI) ECOSYSTEM:introduced=0,fixed=4.6.1.

**Is there a fix for CVE-2018-13348?** Yes. mercurial (PyPI): upgrade to 4.6.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2018-13348?** 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 4.6.1 or later

  ```sh
  pip install "mercurial>=4.6.1"
  ```


## Affected products

- mercurial (PyPI) ECOSYSTEM:introduced=0,fixed=4.6.1

## Identifiers

- CVE-2018-13348
- GHSA-3v62-ww8w-758m
- PYSEC-2018-90

## 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)