GNOME libgepub EPUB File Parser integer overflow

Summaryinfo

A vulnerability was found in GNOME libgepub. It has been rated as problematic. This vulnerability affects unknown code of the component EPUB File Parser. Performing a manipulation results in integer overflow. This vulnerability is identified as CVE-2025-6196. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in GNOME libgepub (version unknown). It has been classified as problematic. This affects an unknown function of the component EPUB File Parser. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on availability. The summary by CVE is:

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.

It is possible to read the advisory at gitlab.gnome.org. This vulnerability is uniquely identified as CVE-2025-6196 since 06/17/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/12/2025).

The vulnerability scanner Nessus provides a plugin with the ID 241236 (SUSE SLES15 Security Update : libgepub (SUSE-SU-2025:02213-1)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (241236) and EUVD (EUVD-2025-18504). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• GNOME

Name

• libgepub

License

• open-source

Website

• Vendor: https://www.gnome.org/

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Be aware that VulDB is the high quality source for vulnerability data.

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