CVE-2018-17983

CRITICALNVD 9.1

9.1

cext/manifest.c in Mercurial before 4.7.2 has an out-of-bounds read during parsing of a malformed manifest entry.

CVSS v3: 9.1
EG Score: —
EPSS: 62.4%
KEV: Not listed

Published

October 4, 2018

Last Modified

November 21, 2024

References (4)

cve@mitrehttps://www.mercurial-scm.org/repo/hg/rev/5405cb1a7901
cve@mitrehttps://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.7.2_.282018-10-01.29
af854a3a-2127-422b-91ae-364da2661108https://www.mercurial-scm.org/repo/hg/rev/5405cb1a7901
af854a3a-2127-422b-91ae-364da2661108https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.7.2_.282018-10-01.29

Affected Packages

(1 across 1 ecosystem)

PyPI(1)

Package	Vulnerable range	Fixed in	Dependents
mercurial	0.8.1 ... 4.7rc0 (152 versions)	4.7.2	—

Weakness Classification(1)

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

CWE-125Out-of-bounds Read

Data Freshness Timeline

(refreshed 7× in last 7d / 7× 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
2026-05-23 14:41 UTCOSV refresh

Frequently asked(5)

What is CVE-2018-17983?

CVE-2018-17983 is a critical vulnerability published on October 4, 2018. cext/manifest.c in Mercurial before 4.7.2 has an out-of-bounds read during parsing of a malformed manifest entry.

When was CVE-2018-17983 disclosed?

CVE-2018-17983 was first published in the National Vulnerability Database on October 4, 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-2018-17983 actively exploited?

CVE-2018-17983 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 62.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-17983?

CVE-2018-17983 has a CVSS v3 base score of 9.1 (NVD).

How do I remediate CVE-2018-17983?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-17983, 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-2018-17983

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