Medium [CVE-2025-6196] Libgepub: integer overflow in libgepub's epub archive handling
This medium-severity Red Hat Linux advisory covers CVE-2025-6196 affecting Red Hat Enterprise Linux 7, Red Hat package: libgepub.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
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 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. The Red Hat Product Security team has rated this vulnerability as Moderate.
It is caused by an integer overflow in libgepub when handling crafted EPUB files, leading to excessive memory allocation and application crashes. The flaw requires user interaction, such as opening or previewing a malicious file.
No remote or unauthenticated exploitation vectors are currently known. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).
Weakness: CWE-190. Affected Red Hat products: Red Hat Enterprise Linux 7.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: libgepub.
Is CVE-2025-6196 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2025-6196 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2025-6196?
The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
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