---
cve: "CVE-2026-18495"
severity: "MEDIUM"
cvss: 6.1
epss: "12%"
vendor: "Red Hat"
kev: false
exploited: false
published: "2026-09-11 18:16:56"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T22:34:03+02:00"
---

# CVE-2026-18495

> 6.1 MEDIUM

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Erforderlich | good |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Hoch | bad |

## Referenzen

- <https://access.redhat.com/errata/RHSA-2026:53467>
- <https://access.redhat.com/security/cve/CVE-2026-18495>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2531414>
- <https://gitlab.com/libtiff/libtiff/-/merge_requests/729>
- <https://gitlab.com/libtiff/libtiff/-/tree/67fd283d276f09db54dc39b9ef7b979d4b45c4b1>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-18495) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_