Integer overflow in GNOME Libgepub
CVE-2025-6196
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.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (13.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2025-6196 (Third Party Advisory, Mitigation, vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Third Party Advisory, Issue Tracking)
- gitlab.gnome.org/GNOME/libgepub/-/issues/18 (Exploit, Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2025-6196?
- CVE-2025-6196 is a medium-severity vulnerability in GNOME Libgepub, classified under Integer Overflow or Wraparound. CVSS score: 5.5/10. Published 2025-06-17.
- How severe is CVE-2025-6196?
- Medium severity. CVSS v3 base score is 5.5 out of 10.