# CVE-2025-6196: Libgepub: integer overflow in libgepub's epub archive handling

> An integer overflow in libgepub allows attackers to cause a denial of service via crafted EPUB files, impacting applications that automatically process these files.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 17 Jun 2025
- **Updated:** 6 Nov 2025
- **Also known as:** DEBIAN-CVE-2025-6196, GHSA-mpq7-j427-mjff, SUSE-SU-2025:02213-1, SUSE-SU-2025:02222-1, UBUNTU-CVE-2025-6196

## What is CVE-2025-6196?

CVE-2025-6196 is a medium-severity vulnerability in Red Hat Enterprise Linux 7, published on 17 Jun 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

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.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2025-6196?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `libgepub` | SUSE:Linux Enterprise Module for Package Hub 15 SP6 | All versions | 0.6.0-150200.3.5.1 |
| `libgepub` | SUSE:Linux Enterprise Module for Package Hub 15 SP6 | All versions | 0.7.1-150600.3.5.1 |
| `libgepub` | SUSE:Linux Enterprise Module for Package Hub 15 SP7 | All versions | 0.6.0-150200.3.5.1 |
| `libgepub` | SUSE:Linux Enterprise Module for Package Hub 15 SP7 | All versions | 0.7.1-150600.3.5.1 |
| `libgepub` | openSUSE:Leap 15.6 | All versions | 0.7.1-150600.3.5.1 |

Products: Gnome Libgepub.

## How do I fix CVE-2025-6196?

Apply the vendor's patch.

## Is CVE-2025-6196 being exploited?

There is no known exploitation of CVE-2025-6196 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-6196 and fix it if it is affected.

What it is: CVE-2025-6196 is a medium-severity vulnerability in Red Hat Enterprise Linux 7, published on 17 Jun 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-6196 in the wild and no public exploit code.

Affected product: Red Hat Enterprise Linux 7. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-6196/ (Markdown: https://insights.sbomify.com/CVE-2025-6196/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-6196
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-6196
- OSV: https://osv.dev/vulnerability/CVE-2025-6196

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-6196/
Summaries are generated and may contain mistakes; the official description above is the record.