CVE-2019-3902: Debian Linux

Medium severity, CVSS 5.9. EPSS: 1.4% chance of exploitation in the next 30 days.

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.

Affected products

• Debian Debian Linux: version 8.0 only
• Mercurial Mercurial: before 4.9 (fixed in 4.9)
• Red Hat Enterprise Linux: version 7.0 only

Published 2019-04-22. Last modified 2026-06-17.