{"id":"CVE-2026-18495","title":"A flaw was found in libtiff","summary":"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, causin…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H","cwe":["CWE-122"],"vendor":"Red Hat","product":"libtiff-main","affected":["libtiff-main (all versions)","ceph","ceph","ceph","ceph","ceph","boost","ceph","libtiff","libtiff","compat-libtiff3","libtiff","compat-libtiff3","libtiff","mingw-libtiff","boost","ceph","libtiff","boost"],"published":"2026-09-11","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:42:43.623","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-18495","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:53467","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-18495","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2531414","label":"secalert@redhat.com"},{"url":"https://gitlab.com/libtiff/libtiff/-/merge_requests/729","label":"secalert@redhat.com"},{"url":"https://gitlab.com/libtiff/libtiff/-/tree/67fd283d276f09db54dc39b9ef7b979d4b45c4b1","label":"secalert@redhat.com"}],"tags":["nvd","cve.org"],"epss":0.00117,"epssPercentile":0.01882,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-11T17:56:50.884605Z"},"ingestedAt":"2026-09-14T00:35:28.535Z","slug":"CVE-2026-18495","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}