CVE-2018-13347

CRITICALNVD 9.8

9.8

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

CVSS v3: 9.8
EG Score: —
EPSS: 79.6%
KEV: Not listed

Published

July 6, 2018

Last Modified

November 21, 2024

References (10)

cve@mitrehttps://access.redhat.com/errata/RHSA-2019:2276
cve@mitrehttps://lists.debian.org/debian-lts-announce/2020/07/msg00032.html
cve@mitrehttps://www.mercurial-scm.org/repo/hg-committed/log?rev=modifies%28%22mercurial%2Fmpatch.c%22%29+and+4.5%3A%3A
cve@mitrehttps://www.mercurial-scm.org/repo/hg/rev/1acfc35d478c
cve@mitrehttps://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.6.1_.282018-06-06.29
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2019:2276
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2020/07/msg00032.html
af854a3a-2127-422b-91ae-364da2661108https://www.mercurial-scm.org/repo/hg-committed/log?rev=modifies%28%22mercurial%2Fmpatch.c%22%29+and+4.5%3A%3A
af854a3a-2127-422b-91ae-364da2661108https://www.mercurial-scm.org/repo/hg/rev/1acfc35d478c
af854a3a-2127-422b-91ae-364da2661108https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.6.1_.282018-06-06.29

Affected Packages

(1 across 1 ecosystem)

PyPI(1)

Package	Vulnerable range	Fixed in	Dependents
mercurial	0.8.1 ... 4.6rc1 (147 versions)	4.6.1	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-190Integer Overflow or Wraparound

Data Freshness Timeline

(refreshed 6× in last 7d / 6× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2018-13347?

CVE-2018-13347 is a critical vulnerability published on July 6, 2018. mpatch.c in Mercurial before 4.6.1 mishandles integer addition and subtraction, aka OVE-20180430-0002.

When was CVE-2018-13347 disclosed?

CVE-2018-13347 was first published in the National Vulnerability Database on July 6, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-13347 actively exploited?

CVE-2018-13347 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 79.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-13347?

CVE-2018-13347 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2018-13347?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-13347, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2018-13347

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