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Vulnerability record · CVE-2020-12267 · published 27 April 2020

CVE-2020-12267: Qt use after free vulnerability

QQt · Qt

setMarkdown in Qt before 5.14.2 has a use-after-free related to QTextMarkdownImporter::insertBlock.

9.8 CVSS 3.1 Critical EPSS 2.4% · top 16.6% CWE-416 · Use after free
9.8CVSS 3.1 base score, v2 7.5
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

setMarkdown in Qt before 5.14.2 has a use-after-free related to QTextMarkdownImporter::insertBlock.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=20450 ExploitIssue TrackingThird Party Advisory
https://codereview.qt-project.org/c/qt/qtbase/+/291706 PatchThird Party Advisory
https://security.gentoo.org/glsa/202007-38 Third Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=20450 ExploitIssue TrackingThird Party Advisory
https://codereview.qt-project.org/c/qt/qtbase/+/291706 PatchThird Party Advisory
https://security.gentoo.org/glsa/202007-38 Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-12267), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.