CVE-2019-3902

MEDIUMNVD 5.1

5.1

A flaw was found in Mercurial before 4.9. It was possible to use symlinks and subrepositories to defeat Mercurial's path-checking logic and write files outside a repository.

CVSS v3: 5.1
EG Score: —
EPSS: 67.5%
KEV: Not listed

Published

April 22, 2019

Last Modified

November 21, 2024

References (10)

secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3902
secalert@redhathttps://lists.debian.org/debian-lts-announce/2019/04/msg00024.html
secalert@redhathttps://lists.debian.org/debian-lts-announce/2020/07/msg00032.html
secalert@redhathttps://usn.ubuntu.com/4086-1/
secalert@redhathttps://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.9_.282019-02-01.29
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3902
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2019/04/msg00024.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2020/07/msg00032.html
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/4086-1/
af854a3a-2127-422b-91ae-364da2661108https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.9_.282019-02-01.29

Affected Packages

(1 across 1 ecosystem)

PyPI(1)

Package	Vulnerable range	Fixed in	Dependents
mercurial	0.8.1 ... 4.9rc0 (158 versions)	4.9	—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 8× 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 13:39 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 16:47 UTCepss_batch
2026-05-23 03:35 UTCOSV refresh

Frequently asked(5)

What is CVE-2019-3902?

CVE-2019-3902 is a medium vulnerability published on April 22, 2019. A flaw was found in Mercurial before 4.9. It was possible to use symlinks and subrepositories to defeat Mercurial's path-checking logic and write files outside a repository.

When was CVE-2019-3902 disclosed?

CVE-2019-3902 was first published in the National Vulnerability Database on April 22, 2019, 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-2019-3902 actively exploited?

CVE-2019-3902 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 67.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2019-3902?

CVE-2019-3902 has a CVSS v3 base score of 5.1 (NVD).

How do I remediate CVE-2019-3902?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-3902, 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-2019-3902

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