---
cve: "CVE-2026-26054"
severity: "MEDIUM"
cvss: 6.8
epss: "6.4%"
vendor: "sumatrapdfreader"
kev: false
exploited: false
published: "2026-09-24 17:17:04"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-26T04:59:14+02:00"
---

# CVE-2026-26054

> 6.8 MEDIUM · 🧪 PoC

## Beschreibung

SumatraPDF is a multi-format reader for Windows. Prior to 3.6, the MobiDoc::ParseHeader function in src/MobiDoc.cpp validates a record using kMobiHeaderMinLen but DecodeMobiDocHeader constructs a decoder sized for kMobiHeaderLen without receiving the actual remaining buffer length. A malformed MOBI file can use an attacker-controlled header length to bypass optional-field early returns and cause the decoder to read beyond a short heap buffer. Opening the crafted document can crash SumatraPDF. This issue is fixed in version 3.6.

## CVSS-Vektor

```
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- b9732699d403ccb41f1135e0bd7f425c475e7689 (Commit)

## Referenzen

- <https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-27p6-wrfp-pgm8>
- <https://github.com/sumatrapdfreader/sumatrapdf/issues/5318>
- <https://github.com/sumatrapdfreader/sumatrapdf/commit/24b9ce83383bbaa48b3efe00e4d30cccea126198>
- <https://github.com/sumatrapdfreader/sumatrapdf/releases/tag/3.6rel>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-26054) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_