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Fencer Vulns
high 7.5

CVE-2018-13346 json

Mercurial Improper Input Validation vulnerability

published 2018-07-06 8 y ago modified 2026-06-17 4 mo ago also GHSA-9xv4-r2hf-26gh , PYSEC-2018-88 , EUVD-2018-0095

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.4%
EPSS 2.4% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

The mpatch_apply function in mpatch.c in Mercurial before 4.6.1 incorrectly proceeds in cases where the fragment start is past the end of the original data, aka OVE-20180430-0004.

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-2018-13346

  • 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-2018-13346

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 RHEL 7 2.6.2-10.el7
  • mercurial-hgk RHEL 7 2.6.2-10.el7
  • emacs-mercurial RHEL 7 2.6.2-10.el7
  • emacs-mercurial-el RHEL 7 2.6.2-10.el7

red hat advisories RHSA-2019:2276

  • 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-2018-13346 updated cvss 4.3

mercurial: Missing check for fragment start position in mpatch.c:mpatch_apply()

  • Red Hat Enterprise Linux 6 mercurial, mercurial-hgk, emacs-mercurial, emacs-mercurial-el
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client Optional (v. 7) mercurial 2.6.2-10.el7, mercurial-hgk 2.6.2-10.el7, emacs-mercurial 2.6.2-10.el7, emacs-mercurial-el 2.6.2-10.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) mercurial 2.6.2-10.el7, mercurial-hgk 2.6.2-10.el7, emacs-mercurial 2.6.2-10.el7, emacs-mercurial-el 2.6.2-10.el7 Red Hat Enterprise Linux Server (v. 7) mercurial 2.6.2-10.el7 Red Hat Enterprise Linux Server Optional (v. 7) mercurial-hgk 2.6.2-10.el7, emacs-mercurial 2.6.2-10.el7, emacs-mercurial-el 2.6.2-10.el7 Red Hat Enterprise Linux Workstation (v. 7) mercurial 2.6.2-10.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) mercurial-hgk 2.6.2-10.el7, emacs-mercurial 2.6.2-10.el7, emacs-mercurial-el 2.6.2-10.el7
    fixed: vendor fix RHSA-2019:2276
  • 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

2.40% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 Vulns 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.