# CVE-2026-18495: tiff: A flaw was found in libtiff

CVE-2026-18495 is fixed in tiff on 1 platform, first by DEBIAN-CVE-2026-18495, released September 12, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-18495
- Priority: Routine
- CVSS: 6.1 (medium)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 11, 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | tiff Debian 14 | 4.7.1-1 | [DEBIAN-CVE-2026-18495](https://patchblox.com/security/data/fix/linux/debian-cve-2026-18495.md) | Sep 12, 2026 |
| Linux | tiff sles 15.7 | 4.0.9-150000.45.72.1 | [SUSE-SU-2026:4845-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4845-1.md) | Nov 7, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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