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Fencer Intel
high 7.5

CVE-2018-13348 json

Mercurial Improper Input Validation vulnerability

published 2018-07-06 8 y ago modified 2026-06-17 4 mo ago also GHSA-3v62-ww8w-758m , PYSEC-2018-90 , EUVD-2018-0097

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi mercurial 4.6.1
  • mercurial mercurial 4.6.1
  • mercurial Debian 14, Debian 13, Debian 12 4.6.1-1

debian advisories DEBIAN-CVE-2018-13348

  • mercurial Ubuntu 14.04 LTS 2.8.2-1ubuntu1.4
  • mercurial Ubuntu 16.04 LTS 3.7.3-1ubuntu1.1
  • mercurial Ubuntu 18.04 LTS 4.5.3-1ubuntu2.1

ubuntu advisories UBUNTU-CVE-2018-13348

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • mercurial SLE Software Development Kit 11 SP4 2.3.2-0.18.9.1
  • mercurial SLE Software Development Kit 12 SP3 2.8.2-15.13.1
  • mercurial SLE Module for Development Tools 15 4.5.2-3.3.1

suse advisories SUSE-SU-2018:1996-1SUSE-SU-2018:1990-1SUSE-SU-2018:1998-1

  • mercurial openSUSE Tumbleweed 5.9.1-2.1

opensuse advisories openSUSE-SU-2024:10586-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-13348 updated cvss 4.3

mercurial: Improper length check in mpatch.c

  • Red Hat Ansible Tower 3 mercurial Red Hat Enterprise Linux 6 mercurial, mercurial-hgk, emacs-mercurial, emacs-mercurial-el Red Hat Enterprise Linux 7 mercurial, mercurial-hgk, emacs-mercurial, emacs-mercurial-el Red Hat Enterprise Linux 8 mercurial, mercurial-chg, mercurial-hgk
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.15% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N
GitHub 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
pypi mercurial
<4.6.1
4.6.1

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.