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CVE-2025-6196

Libgepub: integer overflow in libgepub's epub archive handling

5.5 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.24%Up 0.2 points since Jun 18, 2025
90%50%10%1%

What each source reports

CVE List Score used 5.5

Libgepub: integer overflow in libgepub's epub archive handling

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.

Record
CVE-2025-6196
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-190
Updated
2026-11-05
EUVDEUVD-2025-18504 5.5

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.

Record
EUVD-2025-18504
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-05
GitHub AdvisoriesGHSA-mpq7-j427-mjff 5.5

A flaw was found in libgepub, a library used to read EPUB files. The software mishandles file...

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.

Record
GHSA-mpq7-j427-mjff
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-190
Updated
2026-11-02
NVD 5.5

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.

Record
CVE-2025-6196
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-190
Updated
2026-11-05
OSV 5.5

Libgepub: integer overflow in libgepub's epub archive handling

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.

Record
CVE-2025-6196
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-190
Updated
2026-11-07
OSVDEBIAN-CVE-2025-6196 5.5

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.

Record
DEBIAN-CVE-2025-6196
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-06
OSVUBUNTU-CVE-2025-6196 5.5

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.

Record
UBUNTU-CVE-2025-6196
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVSUSE-SU-2025:02213-1 No score

Security update for libgepub

This update for libgepub fixes the following issues:

  • CVE-2025-6196: Fixed an integer overflow in the EPUB archive handling code that can leads to massive memory allocation and application crash. (bsc#1244704)
Record
SUSE-SU-2025:02213-1
Updated
2026-11-02
OSVSUSE-SU-2025:02222-1 No score

Security update for libgepub

This update for libgepub fixes the following issues:

  • CVE-2025-6196: Fixed an integer overflow in the EPUB archive handling code that can leads to massive memory allocation and application crash. (bsc#1244704)
Record
SUSE-SU-2025:02222-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libgepub
Debian:12
 All versions, plus listed versions
0.7.0-20.7.1-10.7.1-20.7.3-10.7.3-20.7.3-30.7.3-4
 None known
libgepub
Debian:13
 before 0.7.3-1
0.7.3-1
libgepub
Debian:14
 before 0.7.3-1
0.7.3-1
libgepub
SUSE:Linux Enterprise Module for Package Hub 15 SP6
 before 0.6.0-150200.3.5.1
0.6.0-150200.3.5.1
libgepub
SUSE:Linux Enterprise Module for Package Hub 15 SP7
 before 0.6.0-150200.3.5.1
0.6.0-150200.3.5.1
libgepub
SUSE:Linux Enterprise Module for Package Hub 15 SP6
 before 0.7.1-150600.3.5.1
0.7.1-150600.3.5.1
libgepub
SUSE:Linux Enterprise Module for Package Hub 15 SP7
 before 0.7.1-150600.3.5.1
0.7.1-150600.3.5.1
libgepub
openSUSE:Leap 15.6
 before 0.7.1-150600.3.5.1
0.7.1-150600.3.5.1
libgepub
Ubuntu:18.04:LTS
 All versions, plus listed versions
0.5.2-10.5.2-20.5.3-10.6.0-1
 None known
libgepub
Ubuntu:20.04:LTS
 All versions, plus listed versions
0.6.0-2
 None known
libgepub
Ubuntu:22.04:LTS
 All versions, plus listed versions
0.6.0-2
 None known
libgepub
Ubuntu:24.04:LTS
 All versions, plus listed versions
0.7.1-10.7.1-20.7.1-2build10.7.1-2build2
 None known

History

History
RecordedChangedSources
affectedEUVD, NVD, OSV
factsCVE List
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-6196 is a medium vulnerability (CVSS 5.5) in Gnome Libgepub, published June 17, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 14th percentile. Fixed in libgepub 0.7.3-1.

References

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