{"id":"DEBIAN-CVE-2026-18495","details":"A flaw was found in libtiff. A heap-buffer overflow vulnerability exists in the `tiff2pdf` utility due to an integer truncation error when processing crafted BigTIFF files. An attacker can provide a specially crafted BigTIFF file, causing a 64-bit `StripByteCounts` value to be truncated to a 32-bit integer. This leads to an undersized memory allocation and a subsequent out-of-bounds memory copy, resulting in a crash and severe memory corruption.","modified":"2026-09-17T08:47:25.124854006Z","published":"2026-09-11T18:16:56.690Z","upstream":["CVE-2026-18495"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-18495"}],"affected":[{"package":{"name":"tiff","ecosystem":"Debian:12","purl":"pkg:deb/debian/tiff?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.0-6","4.5.0-6+deb12u1","4.5.0-6+deb12u2","4.5.0-6+deb12u3","4.5.0-6+deb12u4","4.5.1+git230720-1","4.5.1+git230720-2","4.5.1+git230720-3","4.5.1+git230720-4","4.5.1+git230720-5","4.5.1-1","4.5.1~rc3-1","4.6.0-1","4.6.0-2","4.7.0-1","4.7.0-2","4.7.0-3","4.7.0-4","4.7.0-5","4.7.1-1","4.7.1-2","4.7.1-3","4.7.2-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18495.json"}},{"package":{"name":"tiff","ecosystem":"Debian:13","purl":"pkg:deb/debian/tiff?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.7.0-3","4.7.0-3+deb13u1","4.7.0-3+deb13u2","4.7.0-3+deb13u3","4.7.0-4","4.7.0-5","4.7.1-1","4.7.1-2","4.7.1-3","4.7.2-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18495.json"}},{"package":{"name":"tiff","ecosystem":"Debian:14","purl":"pkg:deb/debian/tiff?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.7.1-1"}]}],"versions":["4.7.0-3","4.7.0-4","4.7.0-5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18495.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H"}]}