Mercurial Out-of-bounds Read vulnerability

CRITICAL 9.1CVE-2018-17983 · GHSA-p575-cf9h-wv42 · PYSEC-2018-91 · Published 04/10/2018 · updated 17/06/2026

In short

CVE-2018-17983 is a CRITICAL (CVSS 9.1) vulnerability affecting mercurial, mercurial (mercurial).
Chance of exploitation in the next 30 days (EPSS): 2.0%, higher than 80.4% of all vulnerabilities.
Fix: update to 4.7.2 or later.

Package	Affected versions	Patched versions
mercurial PyPI	`< 4.7.2`	`4.7.2`
mercurial mercurial	`< 4.7.2`	`4.7.2`

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

NVD description

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

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Package

Affected versions

Patched versions

PyPI

< 4.7.2

4.7.2

< 4.7.2

4.7.2

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