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Fencer Intel
medium 5.5

CVE-2025-6196 json

Libgepub: integer overflow in libgepub's epub archive handling

published last yr. modified 4d ago also EUVD-2025-18504

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

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.

Patch / fix

  • gitlab.gnome.org libgepub 0.7.2
  • libgepub Debian 14, Debian 13 0.7.3-1

debian advisories DEBIAN-CVE-2025-6196

  • libgepub SLE Module for Package Hub 15 SP7, SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 0.7.1-150600.3.5.1
  • libgepub SLE Module for Package Hub 15 SP7, SLE Module for Package Hub 15 SP6 0.6.0-150200.3.5.1

suse advisories SUSE-SU-2025:02222-1SUSE-SU-2025:02213-1

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-6196 updated cvss 5.5

libgepub: Integer Overflow in libgepub's EPUB Archive Handling

  • Red Hat Enterprise Linux 7 libgepub
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • gitlab.gnome.org https://gitlab.gnome.org/GNOME/libgepub/-/issues/18 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

  • gitlab.gnome.org libgepub
  • Red Hat Red Hat Enterprise Linux 7

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.