CVE-2025-6196: A flaw was found in libgepub, a library used to read EPUB files

Routine

MEDIUM 5.5MITIGATE

CVE-2025-6196 is a medium-severity flaw (CVSS 5.5) affecting libgepub. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-190
Published	2025-06-17
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: gnome

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-06-17 15:15 UTCPublished CVE record published
2026-06-17 10:01 UTCUpdated Record last modified

gnome libgepub MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy libgepub || rpm -q libgepub || libgepub --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-6196?

libgepub: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-6196 being exploited?

CVE-2025-6196 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-6196 affect?

CVE-2025-6196 affects libgepub. Severity is medium (CVSS 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.

How urgent is CVE-2025-6196?

Priority 28/100. Public exploit reference

References

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