{"id":"DEBIAN-CVE-2023-4255","details":"An out-of-bounds write issue has been discovered in the backspace handling of the checkType() function in etc.c within the W3M application. This vulnerability is triggered by supplying a specially crafted HTML file to the w3m binary. Exploitation of this flaw could lead to application crashes, resulting in a denial of service condition.","modified":"2026-09-15T09:02:45.428883631Z","published":"2023-12-21T16:15:10.017Z","upstream":["CVE-2023-4255"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-4255"}],"affected":[{"package":{"name":"w3m","ecosystem":"Debian:12","purl":"pkg:deb/debian/w3m?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.5.3+git20230121-2","0.5.3+git20230121-2.1","0.5.3+git20230121-2.2","0.5.3+git20230121-2.3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-4255.json"}},{"package":{"name":"w3m","ecosystem":"Debian:13","purl":"pkg:deb/debian/w3m?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.3+git20230121-2.1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-4255.json"}},{"package":{"name":"w3m","ecosystem":"Debian:14","purl":"pkg:deb/debian/w3m?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.3+git20230121-2.1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-4255.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}