CVE-2026-18495
Published: September 13, 2026Last modified: October 5, 2026
Description
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.1 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | REQUIRED |
| Scope | UNCHANGED |
| Confidentiality | LOW |
| Integrity impact | LOW |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | tiff | Unknown (4.4.0-r1) |
| 25 LTS | tiff | Fixed (4.7.1-r0) | |
| Stream | tiff | Fixed (4.7.1-r0) | |
| Hardened Containers | 23 LTS | tiff | Unknown (4.4.0-r1) |
| 25 LTS | tiff | Fixed (4.7.1-r0) | |
| Stream | tiff | Fixed (4.7.1-r0) |