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Fencer Vulns
critical 9.8

CVE-2018-13347 json

Mercurial mishandles integer addition and subtraction

published 2018-07-06 8 y ago modified 2026-06-17 4 mo ago also GHSA-3mjj-mr4f-qxmx , PYSEC-2018-89 , EUVD-2018-0096

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

mpatch.c in Mercurial before 4.6.1 mishandles integer addition and subtraction, aka OVE-20180430-0002.

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-2018-13347

  • 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-2018-13347

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

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-2018-13347 updated cvss 7.5

mercurial: Buffer underflow 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

2.72% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
pypi mercurial
<4.6.1
4.6.1

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

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.