{"id":"UBUNTU-CVE-2025-12983","details":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to cause a denial of service condition by submitting specially crafted markdown content with nested formatting patterns.","modified":"2025-11-24T05:15:37Z","published":"2025-11-15T09:15:00Z","upstream":["CVE-2025-12983"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-12983"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-12983"},{"type":"REPORT","url":"https://about.gitlab.com/releases/2025/11/12/patch-release-gitlab-18-5-2-released/"},{"type":"REPORT","url":"https://gitlab.com/gitlab-org/gitlab/-/issues/296257"},{"type":"REPORT","url":"https://hackerone.com/reports/3419588"}],"affected":[{"package":{"name":"gitlab","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/gitlab@8.5.8+dfsg-5?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.4.3+dfsg-9","8.4.3+dfsg-12","8.5.8+dfsg-5"],"ecosystem_specific":{"binaries":[{"binary_name":"gitlab","binary_version":"8.5.8+dfsg-5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-12983.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}