CVE-2026-18495
Libtiff: libtiff: heap-buffer overflow via numeric truncation in the jpeg raw passthrough
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-122 |
| Vendor | red hat |
| Product | red hat hardened images |
| Published | Sep 11, 2026 |
| Last Updated | Sep 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High
Affected Versions
Red Hat / Red Hat Hardened Images
All versions affected Red Hat / Red Hat Ceph Storage 4
All versions affected Red Hat / Red Hat Ceph Storage 6
All versions affected Red Hat / Red Hat Ceph Storage 7
All versions affected Red Hat / Red Hat Ceph Storage 8
All versions affected Red Hat / Red Hat Ceph Storage 9
All versions affected Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Hardened Images
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:53467 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-18495 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2531414 gitlab.com: https://gitlab.com/libtiff/libtiff/-/merge_requests/729 gitlab.com: https://gitlab.com/libtiff/libtiff/-/tree/67fd283d276f09db54dc39b9ef7b979d4b45c4b1
Credits
Red Hat would like to thank Jinbao Chen for reporting this issue.