{"id":"CVE-2010-4237","aliases":["GHSA-7gf7-7wx4-mxmw","PYSEC-2026-665"],"url":"https://o3.security/vulnerability/CVE-2010-4237","summary":"Mercurial Improper Certificate Validation vulnerability","details":"Mercurial before 1.6.4 fails to verify the Common Name field of SSL certificates which allows remote attackers who acquire a certificate signed by a Certificate Authority to perform a man-in-the-middle attack.","published":"2019-10-29T19:15:12Z","modified":"2026-07-06T08:11:12.037621418Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":{"score":0.00814,"percentile":0.53906,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"mercurial","fixedVersion":"1.6.4"}],"fix":{"url":"https://github.com/dscho/hg/commit/4ea63fb25ceeeaaa4cd1026f733b7ea7672c30b3","label":"dscho/hg@4ea63fb"},"references":[{"type":"ADVISORY","url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=598841"},{"type":"ADVISORY","url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2010-4237"},{"type":"ADVISORY","url":"https://bz.mercurial-scm.org/show_bug.cgi?id=2407"},{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2010-4237"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2010-4237"},{"type":"WEB","url":"https://github.com/dscho/hg/commit/4ea63fb25ceeeaaa4cd1026f733b7ea7672c30b3"},{"type":"WEB","url":"https://github.com/dscho/hg/commit/89baabf4fb7abf30ef6fdcf3d455a7893e5cc145"},{"type":"WEB","url":"https://repo.mercurial-scm.org/hg/rev/6ab4a7d3c179"},{"type":"WEB","url":"https://repo.mercurial-scm.org/hg/rev/f2937d6492c5"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-06T08:11:12.037621418Z"}}