---
id: CVE-2025-6196
title: 'Libgepub: integer overflow in libgepub''s epub archive handling'
summary: >-
  A flaw was found in libgepub, a library used to read EPUB files. The software
  mishandles file size calculations when opening specially crafted EPUB files,
  leading to incorrect memory allocations. This issue causes the application to
  cras…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-190
vendor: Red Hat
product: libgepub
affected:
  - libgepub < 0.7.2
  - libgepub (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-06-17T14:45:00.900554Z'
published: '2025-06-17'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T16:32:44.319Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-6196'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2025-6196'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2373117'
    label: RHBZ#2373117
  - url: 'https://gitlab.gnome.org/GNOME/libgepub/-/issues/18'
tags:
  - cve.org
epss: 0.00235
epssPercentile: 0.14576
ingestedAt: '2026-11-05T22:38:31.363Z'
---

## Overview

A flaw was found in libgepub, a library used to read EPUB files. The software mishandles file size calculations when opening specially crafted EPUB files, leading to incorrect memory allocations. This issue causes the application to crash. Known affected usage includes desktop services like Tumbler, which may process malicious files automatically when browsing directories. While no direct remote attack vectors are confirmed, any application using libgepub to parse user-supplied EPUB content could be vulnerable to a denial of service.

## Affected

- `libgepub < 0.7.2`
- `libgepub (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to a widespread installation base, or stability. It is strongly recommended to apply the upstream patch once available.