{"action":"Upgrade mercurial to 4.9 or later.","affected":[{"fixed":"4.9","introduced":"0"}],"component":"mercurial","cve_ids":["CVE-2019-3902"],"ecosystem":"PyPI","epss":0.01362,"exploited":false,"fixed_versions":["4.9"],"ghsa_id":"GHSA-mq66-vcfc-8246","id":"tcs_01M5KG8VK5J3K2M8D5R0NWEW3C","modified_at":"2026-06-10T17:01:23.982379761Z","published_at":"2019-04-22T16:29:00Z","references":["https://osv.dev/vulnerability/PYSEC-2019-188","https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3902","https://lists.debian.org/debian-lts-announce/2019/04/msg00024.html","https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.9_.282019-02-01.29","https://usn.ubuntu.com/4086-1/","https://lists.debian.org/debian-lts-announce/2020/07/msg00032.html","https://github.com/advisories/GHSA-mq66-vcfc-8246"],"severity":{"label":"medium","score":5.9},"sources":[{"source":"osv","source_id":"PYSEC-2019-188","url":"https://osv.dev/vulnerability/PYSEC-2019-188"},{"source":"nvd","source_id":"CVE-2019-3902","url":"https://nvd.nist.gov/vuln/detail/CVE-2019-3902"}],"summary":"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."}